Of, pertaining to, or containing, nitrogen.

Nitric acid.

(inorganic chemistry) A transparent, colourless to pale yellow, fuming corrosive liquid, HNO₃; a highly reactive oxidizing agent used in the production of fertilizers, explosives, and rocket fuels and in a wide variety of industrial processes; once called aqua fortis.

(chemistry) the binary compound of nitrogen and oxygen NO; an unstable compound which rapidly oxidizes in the presence of air.