Definition of fibula noun from the Oxford Advanced Learner's Dictionary

 

fibula

 noun
noun
BrE BrE//ˈfɪbjələ//
 
; NAmE NAmE//ˈfɪbjələ//
 
(pl. fibulae
BrE BrE//ˈfɪbjəliː//
 
; NAmE NAmE//ˈfɪbjəliː//
 
, fibulas)
(anatomy) Skeleton and muscles
 
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the outer bone of the two bones in the lower part of the leg between the knee and the ankle see also tibia See related entries: Skeleton and muscles 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.
See the Oxford Advanced American Dictionary entry: fibula