femur

[fee-mer]
noun, plural femurs, femora [fem-er-uh] .
1.
Anatomy. a bone in the human leg extending from the pelvis to the knee, that is the longest, largest, and strongest in the body; thighbone. See diag. under skeleton.
2.
Zoology. a corresponding bone of the leg or hind limb of an animal.
3.
Entomology. the third segment of the leg of an insect (counting from the base), situated between the trochanter and the tibia.

Origin:
1555–65; < Latin: thigh

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World English Dictionary
femur (ˈfiːmə)
 
n , pl femurs, femora
1.  Nontechnical name: thighbone the longest thickest bone of the human skeleton, articulating with the pelvis above and the knee below
2.  the corresponding bone in other vertebrates
3.  the segment of an insect's leg nearest to the body
 
[C18: from Latin: thigh]

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

femur
1563, from L. femur "thigh," borrowed first as an architectural term, 1799 as "thighbone."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

femur fe·mur (fē'mər)
n. pl. fe·murs or fem·o·ra (fěm'ər-ə)

  1. See thigh.

  2. The long bone of the thigh, and the longest and strongest bone in the human body, situated between the pelvis and the knee and articulating with the hipbone and with the tibia and patella. Also called thighbone.

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
femur   (fē'mər)  Pronunciation Key 
The long bone of the thigh or of the upper 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
Encyclopedia

femur

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
Doctors will soon insert pins into his broken right femur.
The paleontologist and her colleagues removed mineral fragments from the
  interior of the femur by soaking it in a weak acid.
The dead bone is in the femur, the large bone in the thigh, where the femur
  meets the knee.
He had a compound fracture of his femur in two places.
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