Usually means: Extinct seed ferns, primitive plants.
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We found 6 dictionaries that define the word class pteridospermopsida:

General (6 matching dictionaries)
  1. class Pteridospermopsida: Vocabulary.com
  2. class pteridospermopsida: Dictionary.com
  3. Class pteridospermopsida: Rhymezone
  4. class pteridospermopsida: FreeDictionary.org
  5. class pteridospermopsida: Mnemonic Dictionary
  6. class Pteridospermopsida: TheFreeDictionary.com

Definitions from WordNet (Class pteridospermopsida)

noun:  extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies


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