1. Of or pertaining to heat.
2. Of the nature of heat; thermal.

1. Heat stroke resulting from the prolonged exposure to the sun, characterized by extreme pyrexia, prostration, convulsion, and coma.
2. A severe and often fatal illness produced by exposure to excessively high temperatures; especially, when it is related to significant physical exertion.

It is usually experienced with elevated body temperature, lack of sweating, hot dry skin, and neurologic symptoms; including unconsciousness, paralysis, headache, vertigo, and/or confusion. In severe cases, very high fever, vascular collapse, and coma also develop.

1. The network of sense organs and connecting pathways that allow differences in temperature changes.
2. The sense by which differences of temperature are distinguished by thermoreceptors or bodily sense receptors that respond to stimulations of heat and cold temperatures.
3. The capability of perceiving cold and warmth, and so being aware of the differences in the temperatures of external objects.