any of a group of brilliant, long-lasting azo dyes, formed on the fiber by coupling diazotized materials, used chiefly for printing on cotton.
(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 […]
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
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 […]
not divided into zones. (of soil) so young that horizons have not yet developed.