Cuts made carefully with a sharp instrument, especially surgical cuts made by doctors during operations.
From Latin 'incidere' (to cut into), from 'in-' (into) plus 'caedere' (to cut); originally a general term for any deliberate cut, became most common in medical contexts.
Medical incisions are actually designed by surgeons to be placed where they'll least damage you and heal with minimal scars—it's a careful art, not just a cut.
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