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The Adobe Flash Player is required in order to view this content. You can get it here: nitrous oxideOne entry found. Main Entry: nitrous oxide Function: noun Date: 1798 : a colorless gas N2O that when inhaled produces loss of sensibility to pain preceded by exhilaration and sometimes laughter, that is used especially as an anesthetic in dentistry and as a fuel, and that is an atmospheric pollutant and greenhouse gas produced by combustion —called also laughing gas 
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