unio
nounDefinition of unio
1 capitalized : the type genus of the family Unionidae comprising freshwater mussels that have an oblong shell pearly within and covered without by a greenish or blackish epidermis
2 plural unios\-ōz\ or unionides\ˌ⸗⸗ˈänəˌdēz\ : any mussel of Unio or a related genus
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