thighbone

[thahy-bohn]
noun
femur ( def 1 ).

Origin:
1400–50; late Middle English the bane. See thigh, bone

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Collins
World English Dictionary
thighbone (ˈθaɪˌbəʊn)
 
n
a nontechnical name for the femur

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

thighbone thigh·bone (thī'bōn')
n.
See femur.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

thighbone

upper bone of the leg or hind leg. The head forms a ball-and-socket joint with the hip (at the acetabulum), being held in place by a ligament (ligamentum teres femoris) within the socket and by strong surrounding ligaments. In humans the neck of the femur connects the shaft and head at a 125 angle, which is efficient for walking. A prominence of the femur at the outside top of the thigh provides attachment for the gluteus medius and minimus muscles. The shaft is somewhat convex forward and strengthened behind by a pillar of bone called the linea aspera. Two large prominences, or condyles, on either side of the lower end of the femur form the upper half of the knee joint, which is completed below by the tibia (shin) and patella (kneecap). Internally, the femur shows the development of arcs of bone called trabeculae that are efficiently arranged to transmit pressure and resist stress. Human femurs have been shown to be capable of resisting compression forces of 800-1,100 kg (1,800-2,500 pounds)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The goal of treatment is to keep the ball of the thighbone inside the socket.
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