- the excretory organ of many invertebrates, consisting of a tubule with one end opening into the body cavity and the other opening into a pore at the body surface.
Origin of nephridium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nephridium
Such a nephridium from the ninth pair of legs is represented in fig. 28.
D, Lateral view showing the actual relation of the glandular and non-glandular sacs of the nephridium.
The figure is given to shew the peritoneal funnel of the nephridium.The Works of Francis Maitland Balfour, Volume IV (of 4)
Francis Maitland Balfour
Nephridium: The renal organ of mollusks, corresponding to kidneys in vertebrates.The Sea-beach at Ebb-tide
Augusta Foote Arnold
Close to the point where the vesicle joins the coiled section of the nephridium the former has a peculiar nick or bend in it.
- a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior
C19: New Latin: little kidney
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for nephridium
(plural nephridia), 1877, Modern Latin, from Greek diminutive of nephros "kidney" (see nephron).
Online Etymology Dictionary, © 2010 Douglas Harper
- The embryonic excretory organ from which the kidney develops.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.