1670s, "clasp, buckle, brooch;" 1706 as "smaller bone in the lower leg," from Latin fibula "clasp, brooch," related to figere "to fasten, fix" (see fix (v.)).
Used in reference to the outer leg bone as a loan-translation of Greek perone "small bone in the lower leg," originally "clasp, brooch; anything pointed for piercing or pinning;" the bone was so called because it resembles a clasp like a modern safety pin.
fibula fib·u·la (fĭb'yə-lə)
n. pl. fib·u·las or fib·u·lae (-lē')
The outer, narrower, and smaller of the two bones of the human lower leg, extending from the knee to the ankle, and articulating with the tibia above and the tibia and talus below. Also called calf bone.
Plural fibulae (fĭb'yə-lē') or fibulas
The smaller of the two bones of the lower leg or lower portion of the hind leg. See more at skeleton.