: a genus of herbivorous dinosaurs related to and possibly not distinct from Triceratops

Word History


borrowed from New Latin, from Greek aga-, intensifying prefix + New Latin -thaumant-, -thaumas, derivative of Greek thaûma "wonder, marvel" (perhaps after Thaûmas, a son of Pontus and Gaia)

First Known Use

1876, in the meaning defined above

Time Traveler
The first known use of Agathaumas was in 1876

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!

Dictionary Entries Near Agathaumas

Cite this Entry

“Agathaumas.” Dictionary, Merriam-Webster, Accessed 27 Feb. 2024.

Love words? Need even more definitions?

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