any of numerous small crustaceans, especially certain copepods, parasitic on the skin and gills of fish.
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What does “vacillate” mean?
Words nearby fish louse
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for fish louse
any small flat rounded crustacean of the subclass Branchiura, having sucking mouth parts: parasites of fish
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