Definition of trigamous in US English:

trigamous

adjective

  • Having three wives or husbands at the same time.

    • ‘Marriages between members of clades with more than two sexes (such as the Genen Keymales) are known as trigamous, quadrigamous, and so on.’
    • ‘Trigamous insect has no wing and the differences between metameres are not obvious.’
    • ‘There were four cases of monogamy, as well as two bigamous and at least one trigamous relationship in the local population.’
    • ‘Jia Fangjun and his team carried out the research on the development of the rare gobiocypris rarus ¡ ¯s artificial trigamous core and male core.’

Origin

Mid 19th century: from Greek trigamos (from tri- ‘three’ + gamos ‘marriage’) + -ous. The nouns trigamist and trigamy date from the mid 17th century.

Pronunciation

trigamous

/ˈtriɡəməs/