warm-blooded

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Zoology Maintaining a relatively constant and warm body temperature independent of environmental temperature; homeothermic.
• adjective Ardent; passionate.

from The Century Dictionary.

• Having warm blood: hematothermal: in zoölogy and physiology noting mammals and birds whose blood ranges in temperature from 98° to 112° F., in consequence of the complete double blood-circulation, and the oxygenation or combustion which goes on in the lungs: opposed to cold-blooded or hematocryal.
• Figuratively, characterized by high temper and generous impulses; warm-hearted; also, passionate.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective maintaining a relatively constant and warm body temperature, regardless of the ambient temperature
• adjective passionate

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective having warm blood (in animals whose body temperature is internally regulated)