- mixonephridium
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n. [Gr. mixis, mingling; nephros, kidney](ANNELIDA: Polychaeta)A type of nephromixium in which the nephridium and coelomoduct are combined into a single organ having both excretory and genital functions.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.