(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.

(chemistry) The binary compound of nitrogen and iodine, NI₃; a dark red explosive solid.

(chemistry) the binary compound of nitrogen and bromine, NBr₃; a dark red explosive liquid

(now historical) Pertaining to or composed of nitre; having the properties of nitre, bitter.

(dentistry, automotive, informal) Nitrous oxide. / (automotive, informal) The system in some racing vehicles which pumps nitrous oxide into the engine to improve performance.

Nitrogen that has been cooled to the liquid state; used in cryogenics.

(chemistry) Any of a series of compounds, analogous to mustard gas with sulfur replaced by nitrogen, that have been used in the treatment of cancer.

(now historical) Air thought to be charged with nitre. / (chemistry, now historical) Nitric oxide, NO.