noun, plural tibiae [tib-ee-ee] , tibias.
Anatomy. the inner of the two bones of the leg, that extend from the knee to the ankle and articulate with the femur and the talus; shinbone. See diag. under skeleton.
a corresponding bone in a horse or other hoofed quadruped, extending from the stifle to the hock.
(in insects) the fourth segment of the leg, between the femur and tarsus. See diag. under coxa.

1685–95; < Latin tībia literally, reed pipe

tibial, adjective
posttibial, adjective
pretibial, adjective
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World English Dictionary
tibia (ˈtɪbɪə)
n , pl tibiae, tibias
1.  Compare fibula Also called: shinbone the inner and thicker of the two bones of the human leg between the knee and ankle
2.  the corresponding bone in other vertebrates
3.  the fourth segment of an insect's leg, lying between the femur and the tarsus
[C16: from Latin: leg, pipe]

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

lower leg bone, 1726, from L. tibia "shinbone," also "pipe, flute," in which sense it originally came into English (1540s). Of unknown origin. The Latin plural is tibiæ.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tibia tib·i·a (tĭb'ē-ə)
n. pl. tib·i·as or tib·i·ae (-ē-ē')
The inner and larger of the two bones of the lower leg, extending from the knee to the ankle, and articulating with the femur, fibula, and talus. Also called shinbone.

tib'i·al 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
tibia   (tĭb'ē-ə)  Pronunciation Key 
The larger 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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Example sentences
Two partial skulls and the fragment of a tibia had previously been discovered
  in the area.
And she had broken a tibia eight years earlier, the last time she'd been skiing.
X-rays showed a broken left tibia, and team officials said he would need
The tibia is the largest bone in the lower leg, and the injury is at the point
  where the tibia connects to the ankle.
Images for tibia
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