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nephridium definition

ne·phrid·ium (nə frid′ē əm)

noun pl. nephridia -·phrid′ia (-ə)

  1. a waste-discharging tubule with an external excretory pore, found in many invertebrates, as in worms, mollusks, etc.
  2. any of the excretory tubules of the pronephros of a vertebrate embryo

Etymology: ModL < Gr nephridion, dim. of nephros, kidney: see nephro-

Related Forms:

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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