ˌpantəˈthirēə noun plural
Usage: capitalized
Etymology: New Latin, from panto- + -theria
: an order or other division of generalized mammals widespread during the Jurassic and commonly conceded to be ancestral to the marsupials and placental mammals
• pan·to·the·ri·an | ̷ ̷ ̷ ̷|thirēən adjective or noun