'Prototheria' definitions:
Definition of 'Prototheria'
(from WordNet)
noun
Echidnas; platypus [syn: Prototheria, subclass Prototheria]
Definition of 'Prototheria'
From: GCIDE
- Prototheria \Pro`to*the"ri*a\, n. pl. [NL., from Gr. prw^tos first + qhri`on, dim. of qh`r beast.] (Zool.) Same as Monotremata. [1913 Webster]