tib·i·a 
(tĭbē-ə)
(tĭbē-ə)n. pl. tib·i·ae (-ē-ē′) or tib·i·as
1.
a. The inner and larger of the two bones of the lower human leg, extending from the knee to the ankle.
b. A corresponding bone in other vertebrates. Also called shinbone.
2. The fourth division of an insect's leg, between the femur and the tarsus.
3. Music An ancient flute.
[Latin tībia, pipe, shinbone.]
tibi·al adj.