tar·so·met·a·tar·sus 
(tär′sō-mĕt′ə-tärsəs)
(tär′sō-mĕt′ə-tärsəs)n. pl. tar·so·met·a·tar·si (-sī, -sē)
A compound bone between the tibia and the toes of a bird's leg, formed by fusion of the tarsal and metatarsal bones.
tar′so·met′a·tarsal (-tärsəl) adj.