from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A thick triangular muscle covering the shoulder joint, used to raise the arm from the side.
- adj. Triangular.
- adj. Of or relating to the deltoid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The deltoid muscle, a triangular muscle on the human shoulder.
- n. The deltoid ligament, a triangular ligament on the human ankle.
- adj. In the shape of the upper case Greek letter delta Δ; triangular.
- adj. Of, or connected with the deltoid muscle
- adj. Of a triangular or roughly triangular shape and attached to the stem via the side.
from the GNU version of the Collaborative International Dictionary of English
- adj. Shaped like the Greek Δ (delta); delta-shaped; triangular.
- adj. of or pertaining to the deltoid muscle.
- n. the deltoid muscle.
from The Century Dictionary and Cyclopedia
- Resembling the Greek letter
- Specifically— In anatomy:
- Forming a triangular place or part; being triangular: as, the deltoid muscle.
- Relating to the deltoid muscle: as, the deltoid crest of the humerus.
- In entomology, pertaining to or resembling the pyralid moths, or Deltoides.
- In botany, triangular or trowel-shaped: as, a deltoid leaf: also applied to the cross-section of a leaf, etc.
- n. The large, coarse-fibered, triangular muscle of the shoulder, covering and protecting the joint, arising from the spine of the scapula, the acromion, and the clavicle, and inserted into the deltoid crest of the humerus. Its action raises the arm away from the side of the body. See cut under muscle.
- n. In zoology, a deltoid plate.
- n. In mathematics, a symmetrical quadrilateral with a diagonal as axis.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. triangular or suggesting a capital delta, with a point at the apex
- n. a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm
New Latin deltoīdēs, from Greek deltoeidēs, triangular : delta, delta; see delta + -oeidēs, -oid.(American Heritage® Dictionary of the English Language, Fourth Edition)
From deltoideus, which was in turn from Ancient Greek adjective δελτοειδής. See also: δέλτα (delta) the fourth letter of the Greek alphabet. (Wiktionary)