What is "nephrostome"

Nephrostome \Neph"ro*stome\, n. [Gr. nefro`s a kidney + sto`ma mouth.] (Zo["o]l. & Anat.) The funnel-shaped opening of a nephridium into the body cavity.

n. The funnel-shaped opening of a nephridium into the body cavity.

The Nephrostome is the funnel-like component of a metanephridium. It is always oriented towards the coelom. The nephrostome is covered from the inside with cilia, which push the water, metabolic wastes, unnecessary hormones and other substances into the metanephridium.