tibia

Short definition from Wiktionary

Noun

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   A musical instrument of the flute kind, originally made of the leg bone of an animal.