Any of various flatworms of the class Monogenea that typically pass the entire life cycle as an ectoparasite on an individual fish.
[From New Latin Monogenea, class name (originally an order name) : mono- + Greek geneā, race; see genealogy.]
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.
a fluke or parasite that lives on a fish and is a member of the order Monogenea
(Zoology) relating to a monogenean
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014