tibiotarsus
noun
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.
The grammatical form denoting more than one person, place, thing, or idea.
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Heptasteornis is, after all, based only on the incomplete distal ends of tibiotarsi.
From Scientific American ● Sep. 28, 2015