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  1. Oxford Dictionary

    nitrogen

    • IPA[ˈnʌɪtrədʒ(ə)n]

    英式

    • n.
      the chemical element of atomic number 7, a colourless, odourless unreactive gas that forms about 78 per cent of the earth's atmosphere. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.

    • noun: nitrogen