Usually means: Early synapsid, precursor to mammals.
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We found 14 dictionaries that define the word pelycosaur:

General (13 matching dictionaries)
  1. pelycosaur: Merriam-Webster
  2. pelycosaur: Oxford Learner's Dictionaries
  3. pelycosaur: Collins English Dictionary
  4. pelycosaur: Vocabulary.com
  5. pelycosaur: Wordnik
  6. pelycosaur: Wiktionary
  7. pelycosaur: Infoplease Dictionary
  8. pelycosaur: Dictionary.com
  9. Pelycosaur: Wikipedia, the Free Encyclopedia
  10. pelycosaur: Rhymezone
  11. pelycosaur: FreeDictionary.org
  12. pelycosaur: Mnemonic Dictionary
  13. pelycosaur: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. pelycosaur: Encyclopedia

(Note: See pelycosaurs as well.)

Definitions from Wiktionary (pelycosaur)

noun:  Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria.

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