/ Dictionary / Index H hyperpyrexia: Meaning and Definition of Find definitions for: hy•per•py•rex•i•a Pronunciation: (hī"pur-pī-rek'sē-u), [key] — n. Pathol. an abnormally high fever. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hyperpyrexia (Thesaurus) hyperpotassemia hypersecretion Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language