Usually means: Reptile lineage, ancestors of mammals.
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We found 14 dictionaries that define the word synapsid:

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

Computing (1 matching dictionary)
  1. synapsid: Encyclopedia

Science (1 matching dictionary)
  1. synapsid: Natural History Terms

(Note: See synapsids as well.)

Definitions from Wiktionary (synapsid)

adjective:  Pertaining to the class Synapsida, of animals which have an opening low in the skull roof behind each eye, leaving a bony arch beneath each.
noun:  Any animal (all mammals) of the class Synapsida.

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