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Medical Term:


Pronunciation: ni'tro-jen


  1. A gaseous element, atomic no. 7, atomic wt. 14.00674; N2 forms about 78.084% by volume of the dry atmosphere.
  2. The molecular form of nitrogen, N2.
  3. Pharmaceutical grade N2, containing not less than 99.0% by volume of N2; used as a diluent for medicinal gases, and for air replacement in pharmaceutical preparations.

[L. nitrum, niter, + -gen, to produce]

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