also: びなんし
noun
Refers to a man with strikingly good looks; often used in a somewhat formal or literary context.
彼はクラスで一番の美男子だ。
He is the most handsome man in the class.
あの俳優は美男子として有名だ。
That actor is famous as a handsome man.
Compound of 美 (beauty) + 男子 (man, male). The reading びだんし is a regular on'yomi combination; びなんし is an alternative reading possibly influenced by 美男 (びなん).