DELTOID
deltoid
(adjective) triangular or suggesting a capital delta, with a point at the apex
deltoid, deltoid muscle, musculus deltoideus
(noun) a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm
Source: WordNet® 3.1
Etymology
Noun
deltoid (plural deltoids)
(anatomy) The deltoid muscle, a triangular muscle on the human shoulder.
(anatomy) The deltoid ligament, a triangular ligament on the human ankle.
Synonyms
• (muscle): delt (slang)
Adjective
deltoid (not comparable)
In the shape of the upper case Greek letter delta Δ; triangular.
Of, or connected with the deltoid muscle
(botany, of leaves) Of a triangular or roughly triangular shape and attached to the stem via the side.
Source: Wiktionary
Del"toid, a. Etym: [Gr. deltoeidh`s delta-shaped; de`lta the name of
the letter ei^dos form: cf. F. deltoĂŻde. See Delta.]
Definition: Shaped like the Greek Deltoid leaf (Bot.), a leaf in the form
of a triangle with the stem inserted at the middle of the base.
– Deltoid muscle (Anat.), a triangular muscle in the shoulder which
serves to move the arm directly upward.
Source: Webster’s Unabridged Dictionary 1913 Edition