deltoid

[ del-toid ]

noun

1. 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

1. Anatomy. pertaining to or involving the deltoid.
2. Also in the shape of a Greek capital delta (Δ); triangular.

deltoid

/ ˈdɛltɔɪd /

noun

1. the thick muscle forming the rounded contour of the outer edge of the shoulder and acting to raise the arm

adjective

1. shaped like a Greek capital delta, Δ; triangular

Other Words From

• sub·deltoid adjective

Word History and Origins

Origin of deltoid¹

1675–85; < Greek deltoeidḗs delta-shaped, equivalent to délt ( a ) delta + -oeidēs -oid

Word History and Origins

Origin of deltoid¹

C18: from Greek deltoeidēs triangular, from delta

Example Sentences

All of the X-Men were strong, their muscles etched from deltoid to abdomen to quadriceps.

From Slate

Reintegrating Murfee into the bullpen along with Andres Munoz, who returned earlier this week after almost two months on the IL with a right deltoid strain, had Servais again feeling good about how strong the bullpen can be.

From Seattle Times

Munoz has been sidelined since April 9 with a deltoid strain in his right shoulder.

From Seattle Times

Munoz has been on the injured list since April 9 with a right deltoid strain.

From Seattle Times

He was expected to begin a rehab assignment this week until he felt discomfort in his right deltoid during a throwing session.

From Seattle Times

Related Words

• trilateral