unio Meaning, Definition & Usage

  1. noun type genus of the family Unionidae
    genus Unio.

WordNet

U"ni*o noun
Etymology
NL., fr. L. unio unity, union, a single large pearl. See Union.
Definitions
  1. (Zoöl.) Any one of numerous species of fresh-water mussels belonging to Unio and many allied genera.

Webster 1913