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Webster 1913 Edition

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Noun.

[NL. See

, and

(Med.)

A condition of excessive fever; an elevation of temperature in a disease, in excess of the limit usually observed in that disease.

hyperpyrexia ‎(countable and uncountable, plural hyperpyrexias)

(medicine) An excessive and unusual elevation of set body temperature greater than or equal to 41°C (105.8°F), or extremely high fever.