- metanephromixium
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n. [Gr. meta, after; nephros, kidney; mixis, mingling](ANNELIDA: Polychaeta)Nephromixium in which the coelomostome and nephrostome are combined into a genital and/or excretory duct; see mixonephridium.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.