Breadcrumb Home > Dictionary > Index A argon: Meaning and Definition of Find definitions for: ar•gon Pronunciation: (är'gon), [key] — n. Chem. a colorless, odorless, chemically inactive, monatomic, gaseous element that, because of its inertness, is used for filling fluorescent and incandescent lamps and vacuum tubes. Symbol: Ar; at. no.: 18; at. wt.: 39.948. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: argon (Thesaurus) Argolis Argonaut TrendingHere are the facts and trivia that people are buzzing about. Who's Who in the "Lord of the Rings" Roman Catholic Church Hierarchy Current Events This Week: March 2023 42 Top Western Movie Quotes Slaves in the Family User's Guide to Environmental Language ✖ Related Content Daily Word Quiz: plaudit Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language