'eschar' originates from Greek, specifically the word 'eschara', where 'eschara' meant 'a burnt piece or scab'.

'eschar' changed from the Greek word 'eschara' into Late Latin 'eschara', then Old French 'eschare', and eventually became the modern English word 'eschar'.

Initially, it meant 'a piece of burnt material or scab', but over time it evolved into its current meaning of 'a dry scab of necrotic tissue typically resulting from burns or gangrene'.