Might mean (unverified): Extinct, early reptiles resembling lizards.
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We found 2 dictionaries that define the word protorosaur:

General (2 matching dictionaries)
  1. protorosaur: Merriam-Webster
  2. protorosaur: Wiktionary

Definitions from Wiktionary (protorosaur)

noun:  (paleontology) An extinct archosauromorph reptile of the order Protorosauria.

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