The Collaborative International Dictionary of English v.0.48:

Warm-blooded \Warm"-blood`ed\, a. (Physiol.)
   Having warm blood; -- applied especially to those animals, as
   birds and mammals, which have warm blood, or, more properly,
   the power of maintaining a nearly uniform temperature
   whatever the temperature of the surrounding air. See
   Homoiothermal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

warm-blooded
    adj 1: having warm blood (in animals whose body temperature is
           internally regulated) [ant: cold-blooded]