tibia

1. The inner and usually the larger of the two bones of the leg or hind limb below the knee, the shinbone.
2. The second segment from the end of an insect's leg, between the femur and tarsus.
3. The third segment from the end of an arachnid's leg, between the patella and metatarsus.
4. A musical instrument of the flute kind, originally made of the leg bone of an animal.

الجمع tibias