noun
- Anatomy. a large, triangular muscle covering the joint of the shoulder, the action of which raises the arm away from the side of the body.
adjective
- Anatomy. pertaining to or involving the deltoid.
- Also deltoidal. in the shape of a Greek capital delta (Δ); triangular.
noun
- the thick muscle forming the rounded contour of the outer edge of the shoulder and acting to raise the arm
adjective
- shaped like a Greek capital delta, Δ; triangular
1741, in deltoid muscle, so called for its shape, from Greek deltoeides “triangular,” literally “shaped like the letter delta;” see delta + -oid.
adj.
- Of or relating to the deltoid muscle.
- Triangular in shape or outline.
n.
- The deltoid muscle.