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diazonium salt

noun, Chemistry.
any of a group of salts of the general formula ArN 2 X, in which Ar represents an aryl group and X an anion, as benzenediazonium chloride, C 6 H 5 N(N)Cl, many of which are important intermediates in the manufacture of azo dyes.
Origin of diazonium salt
First recorded in 1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for diazonium salt

diazonium salt

any of a class of compounds with the general formula ArN:NM+, where Ar is an aryl group and M is a metal atom; made by the action of nitrous acid on aromatic amines and used in dyeing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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