- an extremely unreactive colourless odourless element of the rare gas series that forms almost 1 per cent (by volume) of the atmosphere. It is used in electric lights. Symbol: Ar; atomic no: 18; atomic wt: 39.948; density: 1.7837 kg/m³; freezing pt: –189.3°C; boiling pt: –185.9°C
WordReference Random House Learner's Dictionary of American English © 2017
- Chemistrya colorless, odorless, inactive gas used in light bulbs.
- Chemistrya 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.
- Greek, neuter of argós inactive, not working, idle, contraction of aergós equivalent. to a- a-6 + érg(on) work + -os adjective, adjectival suffix