Usually means: Early ancestors of modern mammals.
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We found 3 dictionaries that define the word protomammals:

General (3 matching dictionaries)
  1. protomammals: Merriam-Webster
  2. protomammals: Vocabulary.com
  3. protomammals: Wiktionary

(Note: See protomammal as well.)

Definitions from Wiktionary (protomammal)

noun:  Any evolutionary ancestor of the mammals.
▸ Also see protomammal


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