/sub klay"vee euhs/ , n. , pl. subclavii /-vee uy'/ . Anat.
a small shoulder muscle, the action of which assists in depressing the shoulder.
[ 1695-1705; subclavius ( musculus ) subclavian (muscle), equiv. to L sub- SUB- + clavi ( s ) key (see CLAVICLE) + -us adj. suffix ]