argon
Concise Oxford English Dictionary © 2008 Oxford University Press:
argon /ˈɑːgɒn/
▶noun the chemical element of atomic number 18, an inert gaseous element of the noble gas group. (Symbol: Ar)
– origin C19: from Gk, neut. of argos ‘idle’, from a- ‘without’ + ergon ‘work’.
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