'Nephridium' definitions:

Definition of 'Nephridium'

From: GCIDE

Nephridium \Ne*phrid"i*um\, n.; pl. Nephridia. [NL., fr. Gr. ? of the kidneys.] (Zool. & Anat.) A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ. See Illust. under Loeven's larva. [1913 Webster]