- 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
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.