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 ▸ Words similar to protomammals ▸ Usage examples for protomammals ▸ Idioms related to protomammals ▸ Wikipedia articles (New!) ▸ Popular adjectives describing protomammals ▸ Words that often appear near protomammals ▸ Rhymes of protomammals ▸ Invented words related to protomammals