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trapezius

[truh-pee-zee-uh s]
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noun, plural tra·pe·zi·us·es. Anatomy.
  1. a broad, flat muscle on each side of the upper and back part of the neck, shoulders, and back, the action of which raises, or rotates, or draws back the shoulders, and pulls the head backward or to one side.
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Origin of trapezius

1685–95; < New Latin, short for trapezius musculus trapeziform muscle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for trapezius

trapezius

noun plural -uses
  1. either of two flat triangular muscles, one covering each side of the back and shoulders, that rotate the shoulder blades
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Word Origin

C18: from New Latin trapezius (musculus) trapezium-shaped (muscle)
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 trapezius

n.

1704, from Modern Latin trapezius (musculus), masc. adjective from trapezium (see trapezium).

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Online Etymology Dictionary, © 2010 Douglas Harper