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Medical Definition of Paramphistomum
1. The rumen fluke, a genus of digenetic trematodes (family Paramphistomatidae) parasitic in the rumen or paunch of cattle; species include Paramphistomum microbothrioides, Paramphistomum cervi, and Paramphistomum liorchis. Origin: para-+ G. Amphistomos, having a double mouth, fr. Amphi, two-sided, + stoma, mouth (05 Mar 2000)