Synonyms for Deltoid:

adj.

three (adjective)
triangular, ternary, triple, clover-like, Triadic.

n.

body (noun)
deltoid muscle, Musculus Deltoideus.
deltoid (noun)
deltoid muscle, simple, unsubdivided, Musculus Deltoideus.
three (noun)
triple, trimester, clover, trio, triad, troika, trilogy, delta, triptych, trident, tripod, triplet, three, triangle.

Other synonyms:

musculus deltoideus
Musculus Deltoideus.
Other relevant words:
deltoid muscle, simple, unsubdivided, Musculus Deltoideus.