protonephridium Hear it!

protonephridium definition

proto·nephrid·ium (prōt′ō nē frid′ē əm, -nə-)

noun

Zool. a tubular, excretory structure in certain invertebrates, as flatworms, rotifers, and some larvae, usually ending internally in flame cells and having an external pore

Etymology: proto- + nephridium

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.