Etymology
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necrosis (n.)

"death of bodily tissue," 1660s, from Latinized form of Greek nekrosis "a becoming dead, state of death," from nekroun "make dead," from nekros "dead body" (from PIE root *nek- (1) "death"). Related: Necrotic.

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Definitions of necrosis

necrosis (n.)
the localized death of living cells (as from infection or the interruption of blood supply);
Synonyms: mortification / gangrene / sphacelus
From wordnet.princeton.edu