tarsometatarsus

noun, plural tar·so·met·a·tar·si [tahr-soh-met-uh–tahr-sahy, -see] /ˌtɑr soʊˌmɛt əˈtɑr saɪ, -si/. Ornithology.

1. the large bone in the lower leg of a bird with which the toe bones articulate, formed by the fusion of tarsal and metatarsal bones.

noun plural -si (-saɪ)

1. a bone in the lower part of a bird’s leg consisting of the metatarsal bones and some of the tarsal bones fused together