from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A long bone in the leg of a bird between the femur and the tarsometatarsus, consisting of the tibia fused with the proximal bones of the tarsus.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The large bone between the femur and tarsometatarsus in the leg of a bird, formed by the union of the proximal part of the tarsus with the tibia.
from the GNU version of the Collaborative International Dictionary of English
- n. The large bone between the femur and tarsometatarsus in the leg of a bird. It is formed by the union of the proximal part of the tarsus with the tibia.
from The Century Dictionary and Cyclopedia
- n. In ornithology, the tibia, which in a bird consists of a tibia proper with an epiphysis at its distal end, constituted by the proximal portion of the tarsus, in adult life forming the so-called condyles of the tibia.
Sorry, no etymologies found.
You might presume, as I did, that Polyboroides has a unique sort of intertarsal joint, perhaps with the trochlear surfaces of the distal tibiotarsus wrapping onto the posterior surface of the bone as well as the anterior surface.
The find includes a complete hip and four leg bones (femur, fibula, tibiotarsus and hypotarsus).
Dr. Mark Gendzier, a veterinarian, said pins were placed in the radius in its left wing, and the tibiotarsus in the bird's right leg.