tībia

Tībia is the Latin word for a flute — specifically, a pipe instrument made from a hollow bone. The most common bones used were the shinbones of deer, goats, and sheep, because they are straight, hollow, and the right diameter for a wind instrument. The word transferred from the instrument to the bone: the tibia is the shinbone because the shinbone was the flute.

The tibiae (plural) were one of the most important instruments in Roman civic and religious life. Tibicines — tibia players — accompanied sacrifices, funerals, theatrical performances, and military marches. The instrument was so culturally significant that a group of tibicines once went on strike in 311 BCE (recorded by Livy), causing such disruption to religious ceremonies that the Senate had to negotiate their return.

As a bone, the tibia is the larger of the two lower leg bones, running from the knee to the ankle on the medial (inner) side. It bears most of the body's weight in the lower leg. The fibula, its thinner companion, bears almost none. Medieval and Renaissance anatomists retained the Latin flute-word for the bone without much comment — by their time, the connection between shinbone flutes and the anatomical term had become a curiosity rather than a living practice.

English borrowed tibia from Latin in the 18th century for formal anatomy. The everyday English term 'shinbone' is Germanic and descriptive: the bone at the front of the shin. The Latin word is more interesting. The shinbone is called a flute because someone, long ago, picked up a leg bone and made music from it.