deltoid
adjective
- shaped like a delta; triangular
- designating or of a large, triangular muscle which covers the shoulder and raises the arm away from the side
See deltoid in American Heritage Dictionary 4
(dĕlˈtoidˌ)
noun A thick triangular muscle covering the shoulder joint, used to raise the arm from the side.
adjective- Triangular.
- Of or relating to the deltoid.
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