incest

/ˈɪnsɛst/

IPA: /IH1 N S EH0 S T/

noun
  1. 1

    Sexual relations between close relatives, especially immediate family members and first cousins, usually considered taboo; in many jurisdictions, close relatives are not allowed to marry, and incest is a crime.

    Genetic problems caused by incest are thought to have plagued many royal families in the Middle Ages.

Synonyms

Antonyms

verb
  1. 1

    To engage in incestuous sexual intercourse.

Source: https://en.wiktionary.org/wiki/incest