Plural of femur; the thighbones, which are the longest and strongest bones in the human body.
From Latin 'femur' meaning thigh or leg, from Proto-Indo-European root meaning 'to support.' The plural form 'femora' follows the standard Latin pattern for second-declension nouns.
Your femora are so strong they can support about 1,700 pounds of force—that's why femur fractures are so serious and why astronauts' bones weaken in space without gravity pressing down on them.
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