gangrene

English borrowed "gangrene" from French "gangrène", which came from Latin "gangraena", itself from Ancient Greek γάγγραινα (gángraina), meaning "gangrene".

The facts don't show a shift in meaning — the word appears to have carried the same sense of dying, decaying flesh from Greek through Latin and French into English.

The facts given don't point to any English cognate beyond the word itself passed down through this chain.