Prototheria
Pronunciation: /ˌprəʊtə(ʊ)ˈθɪərɪə/
Definition of Prototheria
noun
Zoology- a group of mammals that comprises the monotremes and their extinct relatives. Compare with Theria.
- Subclass Prototheria, class Mammalia
Origin:
modern Latin (plural), from proto- 'first, original' + Greek thēr 'wild beast'