affinal (not comparable)

  1. (anthropology) Of a family relationship by marriage of a relative (or through affinity), as opposed to consanguinity; in-law.
    Antonyms: consanguine
    • 2018, Daniel Elazar, Kinship in the Admiralty Islands, Routledge (ISBN 9781351309660)
      The names of their affinal relatives must be avoided in speaking either to a man or woman, or even when speaking in their presence.

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