Dictionary Definition

transom

1 a window above a door and hinged to a transom [syn: transom window, fanlight]

2 a horizontal crosspiece across a window or separating a door from a window over it [syn: traverse]

User Contributed Dictionary

A crosspiece over a door; a lintel.
A small hinged window above a door or another window.
A horizontal dividing bar in a window.
Any of several transverse structural members in a ship, especially at the stern; a thwart.
The flat or nearly flat stern of a boat or ship.
The horizontal beam on a cross or gallows.

crosspiece over a door

small hinged window above a door

flat stern of a vessel

The term transom may refer to:

Transom (architectural), the horizontal lintel or beam across a window, dividing it into stages or heights. In the U.S. it also can refer to a fixed window over a door or another window.
Transom (nautical), in naval architecture, is the surface that forms the stern of a vessel.

air duct, air hole, air passage, air shaft, air tube, airway, bay, bay window, blowhole, bow window, breathing hole, casement, casement window, cross bitt, crossarm, crossbar, crosspiece, doubletree, fan window, fanlight, grille, lancet window, lantern, lattice, light, louver, louver window, louverwork, naris, nostril, oriel, pane, picture window, port, porthole, rose window, shaft, singletree, skylight, spilehole, spiracle, swingletree, touchhole, transept, transversal, transverse, traverse, vent, ventage, venthole, ventiduct, ventilating shaft, ventilator, whippletree, wicket, wind tunnel, window, window bay, window glass, windowpane