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Douglas Harper's Etymology Dictionary
mankiller

also man-killer, early 15c., from man (n.) + killer. Old English words for this were manslaga, manslieht.

Wiktionary
mankiller

n. One who kills a human being.

Usage examples of "mankiller".

It was also a name for Amazons, like the Moon Maids of the Lion Shrine -- mankillers who obeyed no laws but their own.