The word 'homoeothermal' refers to animals that are capable of maintaining a constant body temperature, a characteristic that distinguishes them from cold-blooded animals. Some synonyms for this term include 'endothermic', 'warm-blooded' and 'homeothermic.' Endothermic animals regulate their body temperature by producing heat internally, while warm-blooded animals maintain high and relatively constant body temperatures in a wide range of environmental conditions. Homeothermic animals are those which maintain a constant body temperature regardless of the temperature of their surroundings. These terms are widely used in biology to describe the thermoregulation of vertebrates, and are important for understanding how animals adapt to the environments in which they live.