Etymology
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trapezius (n.)

muscle over the back of the neck, 1704, from Modern Latin trapezius (musculus), masc. adjective from trapezium (see trapezium). So called from the shape they form.

updated on February 15, 2014

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Definitions of trapezius from WordNet

trapezius (n.)
either of two flat triangular muscles of the shoulder and upper back that are involved in moving the shoulders and arms;
Synonyms: trapezius muscle / cowl muscle / musculus trapezius
From wordnet.princeton.edu, not affiliated with etymonline.