coelomostome
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coelomostome — n. [Gr. koilos, hollow; stoma, mouth] The external opening of a coelomoduct … Dictionary of invertebrate zoology
coelomostome — coe·lo·mo·stome … English syllables
metanephromixium — 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 … Dictionary of invertebrate zoology