2.77a Thermoregulation

understand that homeostasis is the maintenance of a constant internal environment and that body water content and body temperature are examples of homeostasis.

Homeostasis refers to a constant of conditions.
Homeothermic means the same temperature.

Homeothermic organisms have a constant body temperature in relation to environmental temperature. They maintain this condition by usage of a process called thermoregulation.
Mammals maintain a constant body temperature because the optimal temperature of their enzyme catalysed biological reactions is approximately the same as their body temperature.