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nephridium

[nuh-frid-ee-uh m] /nəˈfrɪd i əm/
noun, plural nephridia
[nuh-frid-ee-uh] /nəˈfrɪd i ə/ (Show IPA).
Zoology
1.
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
1875-1880
1875-80; < Neo-Latin; see nephr-, -idium
Related forms
nephridial, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nephridia

nephridium

/nɪˈfrɪdɪəm/
noun (pl) -ia (-ɪə)
1.
a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior
Derived Forms
nephridial, adjective
Word Origin
C19: New Latin: little kidney
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for nephridia

nephridium

n.

(plural nephridia), 1877, Modern Latin, from Greek diminutive of nephros "kidney" (see nephron).

Online Etymology Dictionary, © 2010 Douglas Harper
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nephridia in Medicine

nephridium ne·phrid·i·um (nə-frĭd'ē-əm)
n. pl. ne·phrid·i·a (-ē-ə)
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.
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Encyclopedia Article for nephridia

nephridium

unit of the excretory system in many primitive invertebrates and also in the amphioxus; it expels wastes from the body cavity to the (usually aquatic) exterior. The evolution of nephridia encouraged tissue specialization by eliminating the need for all cells of an organism to be in contact with seawater for diffusion of metabolic wastes.

Learn more about nephridium with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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