/ Thesaurus / H Synonyms of heat hyperpyrexia Find synonyms for: Noun1. heatstroke, heat hyperpyrexia, collapse, prostrationusage: collapse caused by exposure to excessive heatWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language