plural noun Pro·mammalia \¦prō+\

Definition of Promammalia

  1. :  a hypothetical group often treated as a subclass and comprising animals immediately ancestral to the true mammals


\"+\ adjective

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of promammalia

New Latin, from 1pro- + mammalia

Seen and Heard

What made you want to look up Promammalia? Please tell us where you read or heard it (including the quote, if possible).


to criticize severely

Get Word of the Day daily email!