/ Dictionary / Index F fastigium: Meaning and Definition of Find definitions for: fas•tig•i•um Pronunciation: (fa-stij'ē-um), [key] — pl. -i•ums, -i•a the highest point of a fever or disease; the period of greatest development of an infection. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fastigiate fast lane Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language