water louse
- an aquatic isopod of the genus Asellus, common in weedy waterAlso called: water slater
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for water louse
Historical Examples
I soon discovered the cause in the presence of a water-louse, an animal which feeds on these animalcules.
The Dawn of ReasonJames Weir