/ Dictionary / Index L Lyon Office of Arms: Meaning and Definition of Find definitions for: Ly'on Of'fice of Arms' Pronunciation: (lī'un), [key] — Scot Heraldry. Scot Heraldry. SeeAlso called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lyonnesse Lyons Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language