A scar, especially a permanent mark left on the skin or tissue after a wound heals.
From Latin 'cicatrix' (scar), likely from PIE root *sek- (to cut). The medical term entered English through French and Latin anatomical texts.
Cicatrice is the fancy medical term for a scar, and it comes from the same Latin word that gave us 'excise' and 'section'—all from the idea of cutting. Ancient Roman doctors had the vocabulary for this because they dealt with plenty of wounds.
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