sesamoid

English Thesaurus

1. any of several small round bones formed in a tendon where it passes over a joint (noun.body)

hypernym	:	bone, os,
definition	:	rigid connective tissue that makes up the skeleton of vertebrates (noun.body)

hyponym	:	kneecap, kneepan, patella,
definition	:	a small flat triangular bone in front of the knee that protects the knee joint (noun.body)