affinous


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af·fi·nous

(af'i-nŭs),
Pertaining to a marriage in which the partners are related, not by consanguinity but through another marriage.
[L. affinis, related by marriage, fr. ad, to + finis, limit]

affinal

adjective An antiquated term, referring to an interpersonal relationship resulting from marriage; related by marriage; non-sanguineous.