(chemistry, biochemistry) the conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, especially such conversion, by microorganisms in the soil, into a form that can be assimilated by plants

(chemistry) The rapid inversion of the lone pair in a molecule such as a tertiary amine which prevents it from being chiral.

(inorganic chemistry) dinitrogen pentoxide

(biochemistry) a plant or other organism which accomplishes nitrogen fixation

Nitric oxide.

(chemistry) Any oxide of nitrogen.

(chemistry) Synonym of dinitrogen tetroxide

(chemistry) The binary compound of nitrogen and fluorine, NF₃; a corrosive gas.

(chemistry) the binary compound of nitrogen and chlorine, NCl₃; an unstable explosive liquid

(inorganic chemistry) The binary compound NO₂, a brownish gas that is a poisonous air pollutant; it exists in equilibrium with dinitrogen tetroxide.