u|ni|on|id

u|ni|on|id
u|ni|on|id «YOO nee ON ihd», noun.
any member of a large and widely distributed family of freshwater mollusks, especially numerous in the United States, whose developing larvae are parasitic on fish.
[< New Latin Unionidae the family name < Latin ūniō, -ōnis a single large pearl; (originally) union]

Useful english dictionary. 2012.

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