trapezius

 
Pronunciation: /trəˈpiːzɪəs/
(also trapezius muscle)

noun (plural trapezii /-zɪʌɪ/)

Anatomy
  • either of a pair of large triangular muscles extending over the back of the neck and shoulders and moving the head and shoulder blade.

Origin:

early 18th century: from modern Latin, from Greek trapezion 'trapezium' (because of the shape formed by the muscles)