hyperpyrexia Meaning, Definition & Usage

  1. noun extremely high fever (especially in children)

WordNet

Hy`per*py*rex"i*a noun
Etymology
NL. See Hyper-, and Pyrexia.
Definitions
  1. (Med.) A condition of excessive fever; an elevation of temperature in a disease, in excess of the limit usually observed in that disease.

Webster 1913