/ Dictionary / Index S Siege Perilous: Meaning and Definition of Find definitions for: Siege' Per'ilous Pronunciation: [key] — Arthurian Romance. Arthurian Romance. a vacant seat at the Round Table that could be filled only by the predestined finder of the Holy Grail and was fatal to pretenders. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. siege mentality siege piece Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language