Etheria
noun
Ethe·ria
ə̇ˈthirēə,
ēˈ-,
eˈ-,
-thēr-
: a genus (the type of the family Etheriidae) of freshwater lamellibranch mollusks of Africa and Madagascar that attach themselves by one valve to rocks in deep water
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Merriam-Webster unabridged
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