Term Name:	nephridium
Synonyms:
Definition:	An exceretory tubule that usually opens to the exterior by a nephridiopore. The inner end of the tubule may be blind, ending in flame cells (protonephridium) or may open into the coelom through a ciliated funnel (metanephridium).
Ontology:	Uberon Ontology [UBERON:0006972]