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Definition of Prototheria
1. Noun. Echidnas; platypus.
Exact synonyms: Subclass Prototheria
Group relationships: Class Mammalia, Mammalia
Member holonyms: Monotremata, Order Monotremata
Generic synonyms: Class
Group relationships: Class Mammalia, Mammalia
Member holonyms: Monotremata, Order Monotremata
Generic synonyms: Class
Definition of Prototheria
1. n. pl. Same as Monotremata.