IPA: /fɪˈlændərər/
KK: /fɪˈlændərər/
A person, usually a man, who engages in casual romantic relationships without serious intentions; often seen as a flirt or someone who is unfaithful.
He was known as a philanderer, never staying with one woman for long.
Philanderer → It is formed from "philos" (from Greek, meaning love) and "aner" (from Greek, meaning man). The word describes a man who loves or engages in love affairs, often in a casual or unfaithful manner.
Think of a 'man' ('aner') who is known for 'loving' ('philos') many people casually — that's why a philanderer is someone who has many love affairs.