/ Dictionary / Index P pyrexia: Meaning and Definition of Find definitions for: py•rex•i•a Pronunciation: (pī-rek'sē-u), [key] — n. Pathol. fever. feverish condition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pyrexia (Thesaurus) Pyrex pyrheliometer Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language