unio
noun
ˈyünēˌō
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
unioid
adjective
ˈ⸗⸗ˌȯid
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Merriam-Webster unabridged
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