n. A severe case of hyperthermia in which body temperature rises above 40.8°C or 105.1 °F.
the GNU version of the Collaborative International Dictionary of English
n. A physiological disturbance caused by exposure to excessive heat, resulting in rapid pulse, hot dry skin, and fever, leading to loss of consciousness.
The Century Dictionary and Cyclopedia
n. Collapse or fever caused by exposure to excessive heat of the atmosphere. See sunstroke.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. collapse caused by exposure to excessive heat
Word Usage
"Dr. Jury: As the name implies, heatstroke is a very severe heat-related problem."