n. The condition of having an abnormally high body temperature caused by a failure of the heat-regulating mechanisms of the body to deal with the heat coming from the environment.
the GNU version of the Collaborative International Dictionary of English
n. abnormally high body temperature.
The Century Dictionary and Cyclopedia
n. Same as hyperpyrexia.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. abnormally high body temperature; sometimes induced (as in treating some forms of cancer)
Word Usage
"Null says at least 494 children have died since 1998 from heatstroke also known as hyperthermia in vehicles in the USA."