The outermost or farthest parts of something, especially the arms and legs at the ends of a human body.
From Latin 'extremus' (outermost, furthest) which comes from 'exterus' (outer). The word has been used since medieval times to describe the body's furthest-reaching parts.
In Arctic explorers' accounts, extremities—fingers and toes—are often mentioned first as warning signs of frostbite because blood vessels shrink there when your body gets cold to protect your vital organs.
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