What does "therian" mean?

Any member of the taxonomic subclass Theria, the placental and marsupial mammals.

What is a synonym for "therian"?

Common synonyms include: therian animal.

/ˈθɪɹ.i.ən/ adj, noun

adj, noun ·Rare ·Advanced level

Noun

1
Any member of the taxonomic subclass Theria, the placental and marsupial mammals.
2
Clipping of therianthrope. abbreviation, alt-of, clipping

Adjective

From Theria + -ian. From translingual Theria, from Ancient Greek θηρίον (thēríon, “wild beast”).