AskDefine | Define fly

Dictionary Definition

fly adj : (British informal) not to be deceived or hoodwinked


1 two-winged insects characterized by active flight
2 flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent [syn: tent-fly, rainfly, fly sheet, tent flap]
3 an opening in a garment that is closed by a zipper or buttons concealed by a fold of cloth [syn: fly front]
4 (baseball) a hit that flies up in the air [syn: fly ball]
5 fisherman's lure consisting of a fishhook decorated to look like an insect


1 travel through the air; be airborne; "Man cannot fly" [syn: wing]
2 move quickly or suddenly; "He flew about the place"
3 fly a plane [syn: aviate, pilot]
4 transport by aeroplane; "We fly flowers from the Caribbean to North America"
5 cause to fly or float; "fly a kite"
6 be dispersed or disseminated; "Rumors and accusations are flying"
7 change quickly from one emotional state to another; "fly into a rage"
8 pass away rapidly; "Time flies like an arrow"; "Time fleeing beneath him" [syn: fell, vanish]
9 travel in an airplane; "she is flying to Cincinnati tonight"; "Are we driving or flying?"
10 display in the air or cause to float; "fly a kite"; "All nations fly their flags in front of the U.N."
11 run away quickly; "He threw down his gun and fled" [syn: flee, take flight]
12 travel over (an area of land or sea) in an aircraft; "Lindbergh was the first to fly the Atlantic"
13 hit a fly
14 decrease rapidly and disappear; "the money vanished in las Vegas"; "all my stock assets have vaporized" [syn: vanish, vaporize] [also: flown, flew]

User Contributed Dictionary



  • /flaɪ/
  • /flaI/
  • Rhymes with: -aɪ

Etymology 1

flȳġe, flēoge. Cognate with Scots flee, Dutch vlieg, German Fliege, Swedish fluga.


  1. In the context of "Zoology": Any insect of the order Diptera; characterized by having two wings, also called true flies.
  2. In the context of "non-technical": Especially, any of the insects of the family Muscidae, such as the common housefly (other families of Diptera include mosquitoes and midges).
  3. Any similar, but unrelated insect such as dragonfly or butterfly.
  4. A piece of canvas that covers the opening at the front of a tent.
  5. A strip of material hiding the zipper, buttons etc. at the front of a pair of trousers, pants, or underpants.
  6. The free edge of a flag.
  7. The horizontal length of a flag.
  8. In the context of "fishing": A lightweight fishing lure resembling an insect.
  9. A fly ball.
  10. A chest exercise performed by moving extended arms from the sides to in front of the chest. (also flye)
insect of the order Diptera
insect of the family Muscidae
piece of canvas that covers the opening of a tent
strip that hides the opening of trousers/pants or underpants
free edge of a flag
  • Finnish: liehureuna
horizontal length of a flag
  • Danish: flue
  • Finnish: perho
  • French: mouche
  • German: Fliege
  • Icelandic: fiskifluga
  • Romanian: mumeală
  • Spanish: mosca
  • Swedish: fluga
  • Finnish: kaaripallo

Etymology 2

flēogan, from *fleuganan, from *pleuk-. Cognate with Dutch vliegen, German fliegen, Swedish flyga; and (from Indo-European) with Lithuanian plaũkti ‘swim’.


  1. To travel through the air.
    Birds of passage fly to warmer regions as it gets colder in winter.
    The Concorde flew from Paris to New York faster than any other passenger airplane.
    It takes about eleven hours to fly from Frankfurt to Hongkong.
    The little fairy flew home on the back of her friend, the giant eagle.
  2. To flee, to escape.
    Fly, my lord! The enemy are upon us!
  3. transitive ergative To cause to move through the air, to transport by air.
    Charles Lindbergh flew his airplane The Spirit of St. Louis across the Atlantic ocean.
    Why don’t you go outside and fly kites, kids? The wind is just perfect.
    Birds fly their prey to their nest to feed it to their young.
    Each day the post flies thousands of letters around the globe.
  4. colloquial of a proposal or idea To be accepted.
    Let's see if that idea flies.
to travel through the air
to flee, to escape
to cause to travel through the air
to become accepted

Etymology 3

From the noun fly (above), sense flyball.


  1. In the context of "intransitive|baseball": To hit a fly ball; to hit a fly ball which is caught for an out. Compare ground (verb) and line (verb).
    Jones flied to right in his last at-bat.
to hit a flyball

Etymology 4

Origin uncertain; probably from the verb or noun.


  1. Quick-witted, mentally sharp, smart (in a mental sense).
  2. Well dressed, smart in appearance.
    He's pretty fly for a white guy.
well dressed
  • Finnish: tyylikäs
  • German: smart






  • /fɽyː/ or /flyː/


  1. airplane


  1. to fly




  1. flee, run away, escape.
    Fångarna försökte fly från fängelset.
    The prisoners tried to escape from jail.
    Med tårarna strömmande ned för sina kinder flydde hon undan de andra tjejernas glåpord.
    With tears streaming down her cheeks, she fled the taunting words of the other girls.

Extensive Definition

True flies are insects of the Order Diptera (Greek: di = two, and pteron = wing), possessing a single pair of wings on the mesothorax and a pair of halteres, derived from the hind wings, on the metathorax. The common housefly is a true fly and is one of the most widely distributed of animals.
The presence of a single pair of wings distinguishes true flies from other insects with "fly" in their name, such as mayflies, dragonflies, damselflies, stoneflies, whiteflies, fireflies, alderflies, dobsonflies, snakeflies, sawflies, caddisflies, butterflies or scorpionflies. Some true flies have become secondarily wingless, especially in the superfamily Hippoboscoidea, or among those that are inquilines in social insect colonies.
It is a large order, containing an estimated 240,000 species of mosquitos, gnats, midges and others, although under half of these (about 120,000 species) have been described . It is one of the major insect orders both in terms of ecological and human (medical and economic) importance. The Diptera, in particular the mosquitoes (Culicidae), are of great importance as disease transmitters, acting as vectors for malaria, dengue, West Nile virus, yellow fever, encephalitis and other infectious diseases.


Diptera are a diverse order with an enormous range of ecological roles. Every type of trophic level pattern can be seen in the Diptera. Dipteran predators include the robber flies (Asilidae). A variety of herbivores can be found in the Diptera, such as the economically important fruit flies (Tephritidae). Flies are often parasites, including internal parasites such as the bot fly and external parasites such as the mosquito, black fly, sand fly or louse fly. Myiasis is the special term for diseases cause by flies (such as the screw worm fly) infecting living tissue. Many flies eat dead organic matter (detritovores), plant or animal remains. This is especially common in the larval stage, seen in the filter-feeding mosquitoes and black flies, the dung-feeding blow flies (Calliphoridae), or the organic deposit feeding rat-tailed maggot. A number of taxa feed on blood, including horse flies and mosquitoes.
Some flies can be important pollinators for many species of plant (many such fly-specialized plants, such as Stapelia, Rafflesia, and Aristolochia, produce carrion odors), and many flies feed on pollen and nectar of common plants, and can perform incidental pollination. Similar relationships occur between flies and various fungi, with flies dispersing the fungal spores. The basic fly life cycle is egg, larvae (maggots — see below), pupa and adult (winged stage), called holometabolism. There is often a difference in food sources for larvae versus adult dipterans of the same species. For example, mosquito larvae live in standing water and feed on detritus while the adults feed on nectar as their energy source while females utilize blood as their energy source for egg production. Various maggots cause damage in agricultural crop production, including root maggots in rapeseed, midge maggots in wheat, and numerous species of leaf miners (note that since fly maggots have no legs, they almost exclusively feed internally on plants).
Flies rely heavily on sight for survival. The compound eyes of flies are composed of thousands of individual lenses and are very sensitive to movement. Some flies have very accurate 3D vision. A few, like Ormia ochracea, have very advanced hearing organs.


see also List of families of Diptera
There are two generally accepted suborders of Diptera. The Nematocera are usually recognized by their elongated bodies and feathery antennae as represented by mosquitoes and crane flies. The Brachycera tend to have a more roundly proportioned body and very short antennae. A more recent classification has been proposed in which the Nematocera is split into two suborders, the Archidiptera and the Eudiptera, but this has not yet gained widespread acceptance among dipterists.
  1. Suborder Nematocera (77 families, 35 of them extinct) – long antennae, pronotum distinct from mesonotum. In Nematocera, larvae are either eucephalic or hemicephalic and often aquatic.
  2. Suborder Brachycera (141 families, 8 of them extinct) – short antennae, the pupa is inside a puparium formed from the last larval skin. Brachycera are generally robust flies with larvae having reduced mouthparts.
    1. Infraorders Tabanomorpha and Asilomorpha – these comprise the majority of what was the Orthorrhapha under older classification schemes. The antennae are short, but differ in structure from those of the Muscomorpha.
    2. Infraorder Muscomorpha – (largely the Cyclorrhapha of older schemes). Muscomorpha have 3-segmented, aristate (with a bristle) antennae and larvae with three instars that are acephalic (maggots).
Most of the Muscomorpha are further subdivided into the Acalyptratae and Calyptratae based on whether or not they have a calypter (a wing flap that extends over the halteres).
Beyond that, considerable revision in the taxonomy of the flies has taken place since the introduction of modern cladistic techniques, and much remains uncertain. The secondary ranks between the suborders and the families are more out of practical or historical considerations than out of any strict respect for phylogenetic classifications (some modern cladists tend to spurn the use of Linnaean rank names). Nearly all classifications in use now, including this article, contain some paraphyletic groupings; this is emphasized where the numerous alternative systems are most greatly at odds. See list of families of Diptera.
Dipterans belong to the group Mecopterida, that also contains Mecoptera, Siphonaptera, Lepidoptera (butterflies and moths) and Trichoptera. Inside it, they are sometimes classified closely together with Mecoptera and Siphonaptera in the superorder Antliophora .


Diptera are among the most evolved insects, and are usually thought to derive from Mecoptera or a strictly related group. First true dipterans are known from the Middle Triassic, becoming widespread during the Middle and Late Triassic .

Flies in culture

Flies have often been used in mythology and literature to represent agents of death and decay, such as the Biblical fourth plague of Egypt, or portrayed as nuisances (e.g., in Greek mythology, Myiagros was a god who chased away flies during the sacrifices to Zeus and Athena, and Zeus sent a fly to bite the horse Pegasus causing Bellerophon to fall back to Earth when he attempted to ride to Mount Olympus), though in a few cultures the connotation is not so negative (e.g., in the traditional Navajo religion, Big Fly is an important spirit being). Emily Dickinson's poem "I Heard a Fly Buzz When I Died" also makes reference to flies in the context of death.
Not surprisingly, in art and entertainment, flies are also used primarily to introduce elements of horror or the simply mundane; an example of the former is the 1958 science fiction film The Fly (remade in 1986), in which a scientist accidentally exchanges parts of his body with those of a fly. Examples of the latter include trompe l'oeil paintings of the 15th century such as Portrait of a Carthusian by Petrus Christus, showing a fly sitting on a fake frame , a 2001 art project by Garnet Hertz in which a complete web server was implanted into a dead fly, and various musical works (such as Yoko Ono's album Fly, U2's song "The Fly," and Dave Matthews' song "The Fly"). The ability of flies to cling to almost any surface has also inspired the title of Human Fly for stunt performers who stunts involve climbing buildings, including both real life and fictional individuals.
Aside from the fictional and conceptual role flies play in culture, however, there are practical roles that flies can play (e.g., flies are reared in large numbers in Japan to serve as pollinators of sunflowers in greenhouses), especially the maggots of various species.


further Maggot Some types of maggots found on corpses can be of great use to forensic scientists. By their stage of development, these maggots can be used to give an indication of the time elapsed since death, as well as the place the organism died. Maggot species can be identified through the Use of DNA in forensic entomology. The size of the house fly maggot is 10–20 mm (⅜–¾ in). At the height of the summer season, a generation of flies (egg to adult) may be produced in 12–14 days.
Other types of maggots are bred commercially, as a popular bait in angling, and a food for carnivorous pets such as reptiles or birds.
Maggots have been used in medicine to clean out necrotic wounds , and in food production, particularly of cheeses (casu marzu).


image:Medfly.jpg|Ceratitis capitata, "Mediterranean fruit fly" image:Anopheles gambiae mosquito feeding 1354.p lores.jpg|Anopheles gambiae image:Long tongue tachinid fly edit.jpg|Tachinid fly



  • Harold Oldroyd The Natural History of Flies. New York: W. W. Norton.1965.
  • Eugène Séguy Diptera: recueil d'etudes biologiques et systematiques sur les Dipteres du Globe (Collection of biological and systematic studies on Diptera of the World). 11 vols. Text figs. Part of Encyclopedie Entomologique, Serie B II: Diptera. 1924-1953.
  • Eugène Seguy. La Biologie des Dipteres 1950. pp. 609. 7 col + 3 b/w plates, 225 text figs.


  • Colless, D.H. & McAlpine, D.K.1991 Diptera (flies) , pp. 717-786. In: The Division of Entomology. Commonwealth Scientific and Industrial Research Organisation, Canberra (spons.), The insects of Australia.Melbourne Univ. Press, Melbourne.
  • Griffiths, G.C.D. The phylogenetic classification of Diptera Cyclorrhapha, withspecial reference to the structure of the male postabdomen. Ser. Ent. 8, 340 pp. [Dr. W. Junk, N. V., The Hague] (1972).
  • Willi Hennig Die Larvenformen der Dipteren. 3. Teil. Akad.-Verlag, Berlin. 185 pp., 3 pls. 1948
  • Willi Hennig (1954) Flugelgeader und System der Dipteren unter Berucksichtigung der aus dem Mesozoikum beschriebenen Fossilien. Beitr. Ent. 4: 245-388 (1954).
  • Willi Hennig: Diptera (Zweifluger). Handb. Zool. Berl. 4 (2 ) (31):1-337. General introduction with key to World Families. In German.


  • Blagoderov, V.A., Lukashevich, E.D. & Mostovski, M.B. 2002. Order Diptera. In: Rasnitsyn, A.P. and Quicke, D.L.J. The History of Insects, Kluwer Publ., Dordrecht, Boston, London, pp. 227-240.
fly in Min Nan: Hô͘-sîn
fly in Catalan: Mosca
fly in Danish: Tovinger
fly in German: Zweiflügler
fly in Estonian: Kahetiivalised
fly in Modern Greek (1453-): Μύγα
fly in Spanish: Diptera
fly in Esperanto: Dipteroj
fly in Persian: دوبالان
fly in French: Diptera
fly in Korean: 파리류
fly in Italian: Diptera
fly in Hebrew: זבובאים
fly in Latin: Diptera
fly in Lithuanian: Dvisparniai
fly in Dutch: Tweevleugeligen
fly in Japanese: ハエ目
fly in Norwegian: Tovinger
fly in Polish: Muchówki
fly in Portuguese: Diptera
fly in Romanian: Diptera
fly in Russian: Двукрылые
fly in Slovenian: Dvokrilci
fly in Finnish: Kaksisiipiset
fly in Swedish: Tvåvingar
fly in Thai: แมลงวัน
fly in Ukrainian: Двокрилі
fly in Yoruba: Esinsin
fly in Chinese: 雙翅目

Synonyms, Antonyms and Related Words

abscond, absquatulate, advance, aeroplane, airlift, airplane, applique, arachnid, arise, arthropod, ascend, aspire, bait, ball the jack, balloon, barnstorm, barrel, be airborne, be annihilated, be consumed, be destroyed, be gone, be no more, be wiped out, bear, beat a retreat, become airborne, beetle, birdlime, bola, bolt, boom, bowl along, brandish, break, breeze, breeze along, brush, bug, bunk, carry, caterpillar, cease, cease to be, cease to exist, centipede, chilopod, claw skyward, clear out, clip, coast, cobweb, conduct, continue, control, convey, copilot, cruise, cut along, cut and run, cut out, daddy longlegs, dance, dart, dash, decamp, dematerialize, depart, desert, die, die away, die out, diplopod, disappear, dispel, disperse, dissipate, dissolve, do a fade-out, dragnet, drift, drive, dwindle, elapse, elope, endure, erode, evanesce, evaporate, exit, expire, fade, fade away, fade out, ferry, fishhook, flap, flaunt, flee, fleet, flicker, flit, flitter, float, flourish, flow, flow on, flutter, fly aloft, fly low, foot, freight, fugitate, gain altitude, gill net, glide, glissade, go, go AWOL, go away, go by, go fast, go on, ground bait, hang, harvestman, hasten, hexapod, hide, highball, hightail, hook, hop, hover, hurry, hydroplane, ice-skate, imbrication, insect, jet, jig, jump, jump bail, kite, lap, lapse, lariat, larva, lasso, last, leave no trace, leave the ground, leave the scene, levant, lift, lime, lug, lure, maggot, make knots, make off, make tracks, manhandle, manipulate, melt, melt away, melt like snow, meshes, millepede, millipede, mite, mount, navigate, net, nip, noose, nymph, outstrip the wind, overlap, overlapping, overlay, overlayer, pack, pass, pass away, pass by, pass out, peel off, perish, peter out, pilot, plane, plug, poise, pound net, pour it on, press on, proceed, purse seine, retire from sight, retreat, rip, rise, roll on, roller-skate, run, run along, run away, run away from, run away with, run for it, run its course, run off, run on, run out, rush, sail, sailplane, scamper, scape, scoot, scorch, scorpion, screw, scud, seaplane, seine, shake, shoot, show the heels, sideslip, sink, sink away, sizzle, skate, skateboard, skedaddle, ski, skid, skim, skip, skip out, sled, sleigh, slide, slip, slip the cable, slither, snare, sniggle, soar, solo, speed, spider, spinner, spire, springe, squid, storm along, suffer an eclipse, sweep, swing, take, take French leave, take flight, take off, take the air, take to flight, take wing, tarantula, tear, tear along, thunder along, tick, toboggan, toils, tote, transport, trawl, turn tail, undulate, vanish, vanish from sight, volplane, waft, wag, waste, waste away, wave, wear away, whish, whisk, whiz, wield, wigwag, wing, withdraw, wobbler, zing, zip, zoom
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