"deltoid" in the noun sense
1. deltoid, deltoid muscle, musculus deltoideus
a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm
"deltoid" in the adjective sense
1. deltoid
triangular or suggesting a capital delta, with a point at the apex
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License