n pl :  a subclass, suborder, or other taxon of trematode worms which have a complex life cycle involving alternation of sexual reproduction as an internal parasite of a vertebrate with asexual reproduction in a mollusk and often including developmental stages in still other hosts and which include a number of parasites (as the Chinese liver fluke) of humans - compare MONOGENEA  di*ge*ne*an adj or n 
 
 
 
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