nitric oxide, or a mixture of this with other gaseous oxides of nitrogen, obtained by the action of nitric acid on various metals in air.

= nitrous gas n. at nitrous, adj. n.compounds.

a colourless toxic gas, NO, which is typically made by reduction of nitric acid with copper, and reacts readily with oxygen to form nitrogen…

(a) = nitrous oxide n. at nitrous, adj. n.compounds (rare); (b) = nitric oxide n. at nitric, adj. compounds.

A mixture of oxygen and nitrogen, used as a breathing gas by underwater divers; spec. a mixture that contains a lower proportion of nitrogen than is…