Definition of nitrogen
: a nonmetallic chemical element that under standard conditions is a colorless, odorless, inert gas, that constitutes 78 percent of the Earth's atmosphere, and that is used especially in the industrial synthesis of ammonia, as a component of inert atmospheres, and in liquid form as a refrigerant — see Chemical Elements Table
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Time Traveler for nitrogen
The first known use of nitrogen was in 1791
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