Definitions for: Hyperpyrexia

[n] extremely high fever (especially in children)

Webster (1913) Definition: Hy`per*py*rex"i*a, n. [NL. See Hyper-, and
Pyrexia.] (Med.)
A condition of excessive fever; an elevation of temperature
in a disease, in excess of the limit usually observed in that
disease.

See Also: febricity, fever, feverishness, hyperthermia, hyperthermy, pyrexia