philanderer

noun
phi·​lan·​der·​er | \fə-ˈlan-dər-ər \
plural philanderers

Definition of philanderer 

disapproving

: a man who has sexual relations with many women especially : a man who is unfaithful to his wife or partner … on a realistic level King is an incorrigible philanderer who deserts his gentle wife … — Louise Westling [Florenz] Ziegfeld's private life was messy. He was an outrageous philanderer who at one point kept a mistress in the same hotel he lived in with Anna Held. — Alicia Metcalf Miller Until then, public officials who were philanderers or alcoholics … pretty much operated with immunity from disclosure so long as their professional performance was unaffected. — Tom Goldstein

First Known Use of philanderer

1841, in the meaning defined above

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The first known use of philanderer was in 1841

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