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.
ardent, impetuous, or passionate: young and warm-blooded valor.
ardent, impetuous, or passionate
(of birds and mammals) having a constant body temperature, usually higher than the temperature of the surroundings Technical name homoiothermic