tibiotarsus

noun, plural tib·i·o·tar·si [tib-ee-oh-tahr-sahy] /ˌtɪb i oʊˈtɑr saɪ/. Ornithology.

1. the main bone of the leg of a bird, between the femur and tarsometatarsus, formed by the fusion of several tarsal bones with the tibia.

noun

1. the bone in the leg of a bird formed by fusion of the tibia and some of the tarsal bones