Found 2 items, similar to Monotreme.
English → English (WordNet) Definition: monotreme monotreme n : the most primitive mammals comprising the only extant members of the subclass Prototheria [syn: egg-laying mammal ]
English → English (gcide) Definition: Monotreme Monotreme \Mon"o*treme\, n. [Cf. F. monotr[`e]me.] (Zo["o]l.) One of the Monotremata. [1913 Webster]