(n) a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm, Syn.musculus deltoideus, deltoid muscle
a. [ Gr. deltoeidh`s delta- shaped; de`lta the name of the letter Δ + e'i^dos form: cf. F. deltoïde. See Delta. ] 1. Shaped like the Greek Δ (delta); delta-shaped; triangular. [ 1913 Webster ]
Deltoid leaf (Bot.), a leaf in the form of a triangle with the stem inserted at the middle of the base. -- Deltoid muscle (Anat.), a large triangular muscle covering the shoulder joint, which serves to raise the arm directly upward. [ 1913 Webster ]
2. of or pertaining to the deltoid muscle. [ PJC ]
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