Usually means: Reptile lineage including mammals, extinct.
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We found 6 dictionaries that define the word subclass synapsida:

General (6 matching dictionaries)
  1. subclass Synapsida: Vocabulary.com
  2. subclass synapsida: Dictionary.com
  3. Subclass synapsida: Rhymezone
  4. subclass synapsida: FreeDictionary.org
  5. subclass synapsida: Mnemonic Dictionary
  6. subclass Synapsida: TheFreeDictionary.com

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Definitions from WordNet (Subclass synapsida)

▸ noun:  extinct reptiles of the Permian to Jurassic considered ancestral to mammals


Opposite:
supraclass, infraclass, superclass

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Opposite:
supraclass, infraclass, superclass




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