noun, plural fibulae [fib-yuh-lee] , fibulas.
Anatomy. the outer and thinner of the two bones of the human leg, extending from the knee to the ankle. See diag. under skeleton.
Zoology. a corresponding bone, often rudimentary or ankylosed with the tibia, of the leg or hind limb of an animal.
a clasp or brooch, often ornamented, used by the ancient Greeks and Romans.

1665–75; < Neo-Latin; Latin fībula bolt, pin, clasp, probably < *fīvibula, equivalent to fīv(ere), early form of fīgere to fasten, fix + -i- -i- + -bula suffix denoting instrument; the bone so called from its resemblance to the tongue of a clasp

fibular, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fibula (ˈfɪbjʊlə)
n , pl -lae, -las
1.  Compare tibia the outer and thinner of the two bones between the knee and ankle of the human leg
2.  the corresponding bone in other vertebrates
3.  a metal brooch resembling a safety pin, often highly decorated, common in Europe after 1300 bc
[C17: from Latin: clasp, probably from fīgere to fasten]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1706, from L. fibula "clasp, brooch," used in reference to the outer leg bone as a loan-translation of Gk. perone "bone in the lower leg," originally "clasp, brooch;" the bone was so called because it resembles a clasp like a modern safety pin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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.

fib'u·lar (-lər) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fibula   (fĭb'yə-lə)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


outer of two bones of the lower leg or hind limb, probably so named because the inner bone, the tibia, and the fibula together resemble an ancient brooch, or pin. In humans the head of the fibula is joined to the head of the tibia by ligaments and does not form part of the knee. The base of the fibula forms the outer projection (malleolus) of the ankle and is joined to the tibia and to one of the ankle bones, the talus. The tibia and fibula are further joined throughout their length by an interosseous membrane between the bones. The fibula is slim and roughly four-sided; its shape varies with the strength of the attached muscles. In many mammals, such as the horse and the rabbit, the fibula is fused for part of its length with the tibia

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Each leg was missing its fibula, the long, thin bone that anchors the calf muscle and forms the outside of the ankle.
The only subcutaneous parts of the fibula are the head, the lower part of the body, and the lateral malleolus.
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