To turn inside out or to flip outward; used in medical or anatomical contexts.
From Latin 'evertere' (to overturn) where 'e-' is the prefix meaning 'out' and 'vertere' means 'to turn.' The term entered English medical terminology by the 1600s.
Latin gave us 'vertere' (turn) which also produced 'vertex' (top), 'vertical' (standing), and 'avert' (turn away)—'everse' is just one of dozens of English words built from the same 'turn' root, showing how one ancient idea generates a whole family of related words.
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