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The Collaborative International Dictionary of English v.0.48:

Azo- \Az"o-\ [See Azote.] (Chem.) A combining form of azote; (a) Applied loosely to compounds having nitrogen variously combined, as in cyanides, nitrates, etc. (b) Now especially applied to compounds containing a two atom nitrogen group uniting two hydrocarbon radicals, as in azobenzene, azobenzoic, etc. These compounds furnish many artificial dyes. See Diazo-. [1913 Webster]