(Anatomy)the inner and typically larger of the two bones between the knee and the ankle (or the equivalent joints in other terrestrial vertebrates), parallel with the fibula (剖)胫骨 ■(Zoology)the tibiotarsus of a bird (动)(鸟的)胫跗骨 ■(Entomology)the fourth segment of the leg of an insect, between the femur and the tarsus (昆)胫节(即足的第四节)