ˈthirēə, ˈthēr- noun plural
Usage: capitalized
Etymology: New Latin, from Greek thēria, plural of thērion wild animal — more at treacle
in some classifications : a subclass of Mammalia comprising the higher mammals and including the Pantotheria, Metatheria, and Eutheria and excluding the Prototheria and Allotheria
• the·ri·an -ən noun or adjective