Usually means: Embryonic mouth forms before anus.
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We found 5 dictionaries that define the word protostoma:

General (3 matching dictionaries)
  1. protostoma: Wordnik
  2. protostoma: Wiktionary
  3. protostoma: Dictionary.com

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. protostoma: Medical dictionary

Definitions from Wiktionary (protostoma)

noun:  (embryology, obsolete) Synonym of blastopore
noun:  (zoology) In nematodes, a particular division of the stoma (mouthlike opening).

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