nos
 n.— «Taking sly hits of nitrous oxide, or “nos” as it is known on the street, was once a fairly common practice among anaesthetists for whom it was a tool of the trade, Sharpe says.» —“Doctor rubbishes safe ‘nos’ claim” by Greg Meylan Stuff (New Zealand) Apr. 24, 2005. (source: Double-Tongued Dictionary)

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