/ Dictionary / Index L Lyon: Meaning and Definition of Find definitions for: Ly•on Pronunciation: (lī'un for 1 Fr. lyôn for 2), [key] — n. 1797–1849, U.S. pioneer in advocating and providing advanced education for women: founder of Mount Holyoke College. Lyons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lyon (Thesaurus) lyolysis Lyon bean 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