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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for water louse
I soon discovered the cause in the presence of a water-louse, an animal which feeds on these animalcules.The Dawn of Reason|James Weir