From Longman Dictionary of Contemporary Englishtarsustar‧sus /ˈtɑːsəs $ ˈtɑːr-/ noun (plural tarsi) /-saɪ/ [countable] technicalHBH your ankle, or one of the seven small bones in your ankle —tarsal adjective
Examples from the Corpus
tarsus• They include the levator and depressor of the trochanter, tibia and tarsus and the levator of the pretarsus.Origin tarsus (1600-1700) Modern Latin Greek tarsos “bottom of the foot, ankle, edge of the eyelid” 