WordReference Random House Unabridged Dictionary of American English © 2026
ne•phrid•i•um  (nə fridē əm),USA pronunciation n., pl. -phrid•i•a (-fridē ə).USA pronunciation [Zool.]
  1. Zoology, Invertebratesthe 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.
  • Neo-Latin; see nephr-, -idium
  • 1875–80
ne•phridi•al, adj. 


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