nephridium

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ne·phrid·i·um

 (nə-frĭd′ē-əm)
n. pl. ne·phrid·i·a (-ē-ə)
1. A tubular excretory organ in many invertebrates, such as mollusks and earthworms.
2. The excretory organ of a vertebrate embryo from which the kidney develops.

[nephr(o)- + Latin -idium, diminutive suff. (from Greek -idion).]

ne·phrid′i·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

nephridium

(nɪˈfrɪdɪəm)
n, pl -ia (-ɪə)
(Zoology) a simple excretory organ of many invertebrates, consisting of a tube through which waste products pass to the exterior
[C19: New Latin: little kidney]
neˈphridial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ne•phrid•i•um

(nəˈfrɪd i əm)

n., pl. -phrid•i•a (-ˈfrɪd i ə)
an excretory tubule in annelids, mollusks, and other invertebrates that discharges wastes from the body cavity through a pore on the body surface.
[1875–80; < Greek nephr(ós) kidney]
ne•phrid′i•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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