Nephridium n. : A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ. See Illust. under Loeven's larva.

Example:


Taxonomy
cells, Nephridium, metanephridia, protonephridium, free encyclopedia, Protonephridia, terminal, tube, ciliated, organism, metanephridium, body cavity, partial vacuum, perforations, tubules, search, Nephridia, organs.

Defination from the web:
Nephridium. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Nephridia are invertebrate organs which function similar to kidneys. ... metanephridia) is a type of excretory gland or nephridium found in many types of invertebrates such as annelids, arthropods and molluscs. ...