Etymology

unionid

U1N1I1O1N1I1D2

Today it means: Any member of the family Unionidae of bivalves. Full definition →

taxonomic name Unionidae
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The story

  1. taxonomic name · borrowed fromUnionidae
  2. English todayunionid

From taxonomic name Unionidae. Compare unionoid.

Etymology from Wiktionary, CC BY-SA 4.0.