(chemistry) Any oxide of nitrogen.

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

a small gas cylinder of oxygen used in mountain climbing or scuba diving etc

a gas cylinder containing oxygen

the amount of extra oxygen required to oxidize lactic acid in the muscles built up during vigorous exercise

biochemical oxygen demand

biochemical oxygen demand

The amount of oxygen needed by aerobic microorganisms to decompose all the organic matter in a sample of water; it is used as a measure of pollution.

(chemistry) A binary compound of oxygen and fluorine, OF₂; a powerful oxidizing agent.

(chemistry) Any binary compound of oxygen and fluorine.