Usually means: Excretory system in simple invertebrates.
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We found 7 dictionaries that define the word protonephridium:

General (5 matching dictionaries)
  1. protonephridium: Merriam-Webster
  2. protonephridium: Wordnik
  3. protonephridium: Wiktionary
  4. protonephridium: Webster's New World College Dictionary, 4th Ed.
  5. Protonephridium: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. protonephridium: Encyclopedia

Medicine (1 matching dictionary)
  1. Protonephridium: Medical dictionary

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Definitions from Wiktionary (protonephridium)

▸ noun:  (anatomy) A type of nephridium composed of a network of flame cells or solenocytes.

Similar:
holonephridium, flame cell, nephridium, solenocyte, nephridiopore, metanephridium, nephrotome, nephropore, pycnid, hyponome, more...

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Similar:
holonephridium, flame cell, nephridium, solenocyte, nephridiopore, metanephridium, nephrotome, nephropore, pycnid, hyponome, more...



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