Pronunciation: (tib"ē-ō-tär'sus), [key]
—pl. -siPronunciation: (-sī). [key] Ornith.
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.