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n. pl. sea lice
Any of several parasitic copepods, especially Caligus elongatus and Lepeophtheirus salmonis, that infect many species of wild and farmed fish.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.