What term means regulating body temperature internally?

The term for regulating body temperature internally is "thermoregulation". Thermoregulation is a physiological process that allows an organism to maintain a constant internal body temperature, despite fluctuations in the external environment. This process is essential for maintaining homeostasis and ensuring that the body's organs and tissues function properly. Thermoregulation involves a variety of mechanisms, including sweating, shivering, dilation and constriction of blood vessels, and changes in metabolic rate.