/ ˈfɪbjələ; NAmE / noun
( pl. fibu·lae or fibu·las ) ( anatomy ) the outer bone of the two bones in the lower part of the leg between the knee and the ankle
—picture at skeleton
—see also tibia
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WORD ORIGIN
late 16th cent.: from Latin , brooch , perhaps related to figere to fix. The bone is so named because the shape it makes with the tibia resembles a clasp, the fibula being the pin.