noun, plural tibiotarsi [tib-ee-oh-tahr-sahy] . Ornithology.
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.

1880–85; tibi(a) + -o- + tarsus

tibiotarsal, adjective
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World English Dictionary
tibiotarsus (ˌtɪbɪəʊˈtɑːsəs)
the bone in the leg of a bird formed by fusion of the tibia and some of the tarsal bones
[C19: from tibio- (combining form of tibia) + tarsus]

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