Definition of tibiae:
(n) :
(anatomy) The inner and usually the larger of the two bones of the leg or hind limb below the knee, the shinbone.
(n) :
A musical instrument of the flute kind, originally made of the leg bone of an animal.
(n) :
(entomology) The second segment from the end of an insect's leg, between the femur and tarsus.
(n) :
(arachnology) The third segment from the end of an arachnid's leg, between the patella and metatarsus.