Azoic dye



any of a group of brilliant, long-lasting azo dyes, formed on the fiber by coupling diazotized materials, used chiefly for printing on cotton.

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  • Azoic

    (formerly) noting or pertaining to the Precambrian Era, especially that part formerly believed to precede the first appearance of life; Archean. of, relating to, or characteristic of the azo group. Historical Examples There are traces of periods of superabundant ice and snow, of “Glacial Ages,” that is, even in the azoic period. A Short History […]

  • Azoimide

    hydrazoic acid. Historical Examples The solution is then acidified and distilled, when azoimide passes over. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 Various



  • Azole

    any of a group of five-membered heterocyclic compounds containing one or more nitrogen atoms in the ring, the number of nitrogen atoms present being indicated by a prefix, as in diazole. Historical Examples The latter, known as ethylene-selenourea, may be classified also in the azole group as 2-iminotetrahydroselenazole (V). Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its […]

  • Azonal

    not divided into zones. (of soil) so young that horizons have not yet developed.



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