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noun, plural fe·murs, fem·o·ra [fem-er-uh] /ˈfɛm ər ə/.
  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.
  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.
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Origin of femur

1555–65; < Latin: thigh
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for femur


noun plural femurs or femora (ˈfɛmərə)
  1. the longest thickest bone of the human skeleton, articulating with the pelvis above and the knee belowNontechnical name: thighbone
  2. the corresponding bone in other vertebrates
  3. the segment of an insect's leg nearest to the body
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Word Origin

C18: from Latin: thigh
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for femur


1560s, from Latin femur "thigh," of unknown origin; borrowed first as an architectural term, 1799 as "thighbone."

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Online Etymology Dictionary, © 2010 Douglas Harper

femur in Medicine


femur in Science


The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.