Definition of unionid in English:

unionid

noun

  • A bivalve mollusc of the family Unionidae ; a unio.

adjective

  • Designating molluscs of the family Unionidae ; relating to or characteristic of this family.

Origin

Mid 19th century; earliest use found in Philip Carpenter (1819–1877), social reformer and conchologist. From scientific Latin Unionidae, family name from Unio unio + -idae, with insertion of -n- after classical Latin ūniōn-, ūniō, etymon of the first element.

Pronunciation

unionid

/ˈjuːnɪənɪd/