| argon | (noun) a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere | Synonyms: Ar, atomic number 18 |
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| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| argonon | (noun) any of the chemically inert gaseous elements of the helium group in the periodic table | Synonyms: inert gas, noble gas |
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| argosy | (noun) one or more large merchant ships | - |
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| argot | (noun) a characteristic language of a particular group (as among thieves) | Synonyms: cant, jargon, lingo, patois, slang, vernacular |
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