[n] a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm [adj] of a leaf shape; suggesting a capital delta, with a point at the apex
deltoid muscle, musculus deltoideus, simple, unsubdivided
centrifugal, cuneate, cuneated, cuneiform, deltalike, delta-shaped, divaricate, divaricating, divergent, diverging, fanlike, fanned, fanning, fan-shape, fan-shaped, flabelliform, flared, flaring, open, outspread, outstretched, oxygonal, palmate, palmated,