ar ‧ gon /ˈɑːɡɒn $ ˈɑːrɡɑːn/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Greek ; Origin: argos 'lazy' ; because it does not react chemically ]
a colourless gas that is found in very small quantities in the air and is sometimes used in electric light ↑ bulb s . It is a chemical ↑ element : symbol Ar