SINCE 1828
dictionary
thesaurus

promammal

noun
Save Word
pro·​mammal | \ (ˈ)prō+ \

Definition of promammal

1 : an extinct reptile exhibiting definite mammalian characteristics especially : a synapsid reptile
2a : a primitive mammal (as a platypus) not exhibiting all the characteristics of the group
b : one of the Protomammalia

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for promammal

pro- entry 1 + mammal

Learn More About promammal

Dictionary Entries Near promammal

prom

promammal

Promammalia

See More Nearby Entries 

Statistics for promammal

Cite this Entry

“Promammal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/promammal. Accessed 26 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

fetter

Listen to the pronunciation of fetter

See Definitions and Examples »

Test Your Vocabulary

Eponyms: Words Named After People

  • rubens painting
  • What is the best definition of boycott?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games