tibia

noun (plural tibiae /ˈtibēˌē/ or tibias)

• 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.
• Zoology the tibiotarsus of a bird.
• Entomology the fourth segment of the leg of an insect, between the femur and the tarsus.