Crossword Genius

Non-technical term for nitrous oxide (8,3)

Ross

I believe the answer is:

laughing gas

(Other definitions for laughing gas that I've seen before include "Name for nitrous oxide" , "Old number" , "Early anaesthetic; nitrous oxide" , "it'll knock you out" , "Mild anaesthetic used in dentistry and surgery" .)

I've seen this clue in The Mirror.
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