An arm or leg of a human or animal, or a large branch of a tree.
From Old English 'lim' and Germanic roots. The word has stayed relatively unchanged for over a thousand years and applies both to animal body parts and tree branches.
Your limbs developed from the same basic 'fin bones' that fish use to swim—over millions of years those fish fins became the bones in your arms and legs, which is why if you study skeletal anatomy, a fish's fin looks eerily similar to your own arm.
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