deltoid

n.
A thick triangular muscle covering the shoulder joint, used to raise the arm from the side.

adj.

1. Triangular.
2. Of or relating to the deltoid.

[New Latin deltoīdēs, from Greek deltoeidēs, triangular : delta, delta; see delta + -oeidēs, -oid.]

1. triangular.
2. the deltoid muscle.

• d. muscle — a lateral muscle of the shoulder, between the scapula and the humerus that helps flex the shoulder and abducts the arm. See also Table 13.

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