(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]
