(ˈ)yü+ noun plural
Usage: capitalized
Etymology: New Latin, from eu- + Theria
: a major division of Mammalia originally coextensive with the subclass Theria but in modern usage an infraclass or other division of Theria comprising the placental mammals as opposed to the Metatheria
• eu·the·ri·an (ˈ)yü|thirēən adjective or noun