: a genus of lower Eocene perissodactylous mammals about the size of a fox having four-toed forelimbs and three-toed hind limbs and regarded as among the earliest ancestors of the modern horse

Word History


New Latin Hyrac-, Hyrax + -o- + -therium

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 Hyracotherium

Cite this Entry

“Hyracotherium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Hyracotherium. Accessed 30 Nov. 2023.

Love words? Need even more definitions?

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