Found 2 items, similar to Prototheria.
English → English (WordNet) Definition: Prototheria Prototheria n : echidnas; platypus [syn: subclass Prototheria]
English → English (gcide) Definition: Prototheria Prototheria \Pro`to*the"ri*a\, n. pl. [NL., from Gr. prw^tos first + qhri`on, dim. of qh`r beast.] (Zo["o]l.) Same as Monotremata. [1913 Webster]