noun
Rare, literary term for a man who commits adultery or is the lover of a married woman. Strongly negative and old-fashioned; modern Japanese would more commonly use 不倫相手 or 間男.
古典文学では、姦夫はしばしば悲劇的な結末を迎える。
In classical literature, the adulterer often meets a tragic end.
Compound of 姦 (adultery, wickedness) and 夫 (man, husband). The exact historical derivation is uncertain, but the word follows a classical Chinese pattern for labeling a male wrongdoer in a sexual context.