Any of a class of inhalant recreational drugs, originally developed for the treatment of angina.

(inorganic chemistry) A weak acid, HNO₂, known only in solution, or as its salts and esters, the nitrites; it has a linear structure, H-O-N=O

(chemistry) Any salt or ester of nitrous acid. / (chemistry) The univalent radical -NO₂, and the anion NO₂⁻

(organic chemistry) nitrocellulose.

(organic chemistry) A cotton-like material, made from cellulose by the action of nitric and sulphuric acids, used in the manufacture of explosives, collodion etc.

A condition of disorientation, intoxication and stupor caused by increased levels of dissolved nitrogen in the blood; occurs in divers breathing air under pressure.

The natural circulation of nitrogen, in which atmospheric nitrogen is converted to nitrogen oxides by lightning and deposited in the soil by rain, where it is assimilated by plants and either eaten by animals (and returned as faeces) or decomposed back to elemental nitrogen by bacteria.

Of a plant, microbe, etc., able to convert inorganic nitrogen into a form usable in the biosphere.

(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.