Pronunciation: (tib'ē-u),[key] —n., —pl.tib•i•aePronunciation: (tib'ē-ē"),[key]tib•i•as. 1. Anat.the inner of the two bones of the leg, that extend from the knee to the ankle and articulate with the femur and the talus; shinbone. See diag. under skeleton. 2. Zool. a. a corresponding bone in a horse or other hoofed quadruped, extending from the stifle to the hock.
b. (in insects) the fourth segment of the leg, between the femur and tarsus. See diag. under coxa.