therian
noun
the·ri·an
ˈthir-ē-ən 
: any of a subclass (Theria) of mammals comprising the marsupials and the placental mammals
therian
adjective
Examples of therian in a Sentence
Recent Examples on the Web
While tracking these changes in the lifestyles of the therians would typically involve the investigation of full skeletons, Janis and her team were able to stick to the analysis of fossil fragments.
—
Sam Walters, Discover Magazine, 2 Apr. 2025
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Sam Walters, Discover Magazine, 2 Apr. 2025
Cite this Entry
“Therian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/therian. Accessed 2 Nov. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share