WordReference Random House Unabridged Dictionary of American English © 2019
fe•mur  (fēmər),USA pronunciation n., pl.  fe•murs, fem•o•ra 
    (femər ə).USA pronunciation 
  1. Anatomya 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. Zoologya corresponding bone of the leg or hind limb of an animal.
  3. Insects[Entomol.]the third segment of the leg of an insect (counting from the base), situated between the trochanter and the tibia. See diag. under  coxa. 
  • Latin: thigh
  • 1555–65

Collins Concise English Dictionary © HarperCollins Publishers::

femur /ˈfiːmə/ n ( pl femurs, femora /ˈfɛmərə/)
  1. the longest thickest bone of the human skeleton, articulating with the pelvis above and the knee below
    Nontechnical name: thighbone
  2. the corresponding bone in other vertebrates
Etymology: 18th Century: from Latin: thigh

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