noun, plural nephridia [nuh-frid-ee-uh] . Zoology.
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.

1875–80; < Neo-Latin; see nephr-, -idium

nephridial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nephridium (nɪˈfrɪdɪəm)
n , pl -ia
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 10th Edition
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American Heritage
Medical Dictionary

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
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