argon
n. C1 Advanced US //ˈɑɹˌɡɑn// UK //ˈɑːɡɒn// ar·gon
n. a colorless, odorless gas that is part of the air we breathe. It is used in things like light bulbs and to keep food fresh in packages.
n. a colorless, odorless, tasteless noble gas occurring in the Earth's atmosphere. It is chemically inert and is used in various industrial applications including lighting and food preservation.
Argon is used to fill the glass tubes in old light bulbs.
Because argon is chemically inert and does not react with other elements, it serves as an ideal protective atmosphere for high-precision manufacturing processes.
From Ancient Greek ἀργός (argós, “idle, lazy”), because of its inertness, + -on, used for all noble gases.