deltoid adj : of a leaf shape; suggesting a capital delta, with a point at the apex n : a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm [syn: deltoid muscle, musculus deltoideus]

English

Etymology

• The Greek adjective δελτοειδής.

Noun

1. The deltoid muscle, a triangular muscle on the human shoulder.

Adjective

1. In the shape of the upper case Greek letter delta Δ; triangular.
2. Of, or connected with the deltoid muscle
3. botany of leaves Of a triangular or roughly triangular shape and attached to the stem via the side.

Derived terms

• obdeltoid

Deltoid (delta-shaped) can refer to:

• The deltoid muscle, a muscle in the shoulder
• Kite (geometry), also known as a deltoid, a type of quadrilateral
• A deltoid curve, a three-sided hypocycloid
• A leaf shape
• The deltoid tuberosity, a part of the humerus

See also

• Delta, an article with related definitions.
• John McPhee wrote a book titled The Deltoid Pumpkin Seed (1973) ISBN 0-374-51635-9.

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