I don't think there is one, but you could have some language fun by calling her ' the other other woman ' or ' another other woman '. I don't think I've seen ' other man ' used. Maybe another member has.
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JingtianThen a man who has affairs with another man's wife is that woman's __.
Such a man is called __.
Such men and women are called __. (Is there a generic term?)
I'd say she's her lover. I've never heard "other man" except in jest. If you said "I spent three years being 'the other man' and I finally accepted she would never leave her husban