- 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.
- Anatomy. pertaining to or involving the deltoid.
- Also deltoidal. in the shape of a Greek capital delta (Δ); triangular.
Origin of deltoid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for deltoid
A red dab over the sternum, and on each arm in front of the deltoid.Castes and Tribes of Southern India
(1-2 inches) long; leaves narrowly ovate to deltoid, 2.5-6 cm.Trees of Indiana
Charles Clemon Deam
He told her what Sopley had said about his deltoid, Henson about his thigh.The Story of Louie
What has become of the other two, the sterno-cleido mastoid and the deltoid?
The portion of this muscle which is next the scapula is covered by the deltoid.
- the thick muscle forming the rounded contour of the outer edge of the shoulder and acting to raise the arm
- shaped like a Greek capital delta, Δ; triangular
C18: from Greek deltoeidēs triangular, from delta
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for deltoid
Online Etymology Dictionary, © 2010 Douglas Harper
- Of or relating to the deltoid muscle.
- Triangular in shape or outline.
- The deltoid muscle.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.