plural noun Dei·no·ce·pha·lia \ˌdīnōsə̇ˈfālyə\

Definition of Deinocephalia

  1. :  a suborder of Therapsida comprising reptiles known from Permian fossils of southern Africa and Russia that had massive skulls and heavy legs and included the largest of the reptiles foreshadowing mammals, some exceeding the modern rhinoceros in size


adjective or noun

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 deinocephalia

New Latin, from din- + cephal- + -ia

Seen and Heard

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


to criticize severely

Get Word of the Day daily email!