TRAPEZIUS /tɹəˈpiːziəs/ Scrabble 20 Words With Friends 22 Definition noun 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 See all 415 words you can make from TRAPEZIUS → 9-letter words Words starting with T Words ending with S ← Unscramble different letters