Search Result for "monotreme": 
Wordnet 3.0

NOUN (1)

1. the most primitive mammals comprising the only extant members of the subclass Prototheria;
[syn: monotreme, egg-laying mammal]



The Collaborative International Dictionary of English v.0.48:

Monotreme \Mon"o*treme\, n. [Cf. F. monotr[`e]me.] (Zool.)
   One of the Monotremata.
   [1913 Webster]


WordNet (r) 3.0 (2006):

monotreme
    n 1: the most primitive mammals comprising the only extant
         members of the subclass Prototheria [syn: monotreme,
         egg-laying mammal]