argon
/ˈɑːgɒn/noun
mass noun
- the chemical element of atomic number 18, an inert gaseous element of the noble gas group. Argon is the commonest noble gas, making up nearly one per cent of the earth's atmosphere. Symbol: Ar.（化学元素）氩（符号： Ar）。
词源
late 19th cent.: from Greek， neuter of argos 'idle'， from a- 'without' + ergon 'work'.