warmblooded

WordReference Random House Learner's Dictionary of American English © 2026

ˈwarm-ˈblood•ed,  adj. 

1. Zoology of or naming an animal, as a mammal, having a relatively constant body temperature in spite of different temperatures in the surrounding environment.

warm-blood•ed•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2026

warm-blood•ed  (wôrm′blud′id), adj. 

1. Also, endothermic. designating or pertaining to animals, as mammals and birds, whose blood ranges in temperatures from about 98° to 112°F (37° to 44°C) and remains relatively constant, irrespective of the temperature of the surrounding medium;
   homoiothermal.
2. ardent, impetuous, or passionate:
   young and warm-blooded valor.

• 1785–95

warm′-blood′ed•ness, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

warm-blooded adjective

1. ardent, impetuous, or passionate
2. (of birds and mammals) having a constant body temperature, usually higher than the temperature of the surroundings
   Technical name: homoiothermic

ˌwarm-ˈbloodedness noun