Definition of Thylacoleo
: a genus (coextensive with the family Thylacoleontidae) of Pleistocene Australian marsupial mammals having a skull about the size of that of a lion, large tusks, and crushing molars
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!
Origin and Etymology of thylacoleo
New Latin, from Greek thylakos sack + Latin leo lion — more at lion
Seen and Heard
What made you want to look up Thylacoleo? Please tell us where you read or heard it (including the quote, if possible).