tarsometatarsusPronunciation: /ˌtɑːsəʊmɛtəˈtɑːsəs/Definition of tarsometatarsus noun (plural tarsometatarsi /-sʌɪ, -siː/) Zoology a long bone in the lower leg of birds and some reptiles, formed by fusion of tarsal and metatarsal structures. Derivatives tarsometatarsal adjective tarsometatarsus in other Oxford dictionaries Definition of tarsometatarsus in the US English dictionary