eutherian
adjective
eu·the·ri·an yü-ˈthir-ē-ən 
: of or relating to a major division (Eutheria) of mammals comprising the placental mammals
eutherian noun
Example Sentences
Recent Examples on the Web To do that, Harris Lewin, an evolutionary geneticist at the University of California, Davis, and colleagues compared 19 genomes of various mammals at different spots in the eutherian family tree, including several primates. 
Elizabeth Pennisi, Science | AAAS, 19 June 2017
Elizabeth Pennisi, Science | AAAS, 19 June 2017 Word History
Etymology
ultimately from New Latin eu- + Greek thērion beast — more at treacle
First Known Use
1880, in the meaning defined above