• synonyms


[dahy-az-oh, -ey-zoh]
adjective Chemistry.
  1. containing the diazo group.
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Origin of diazo

First recorded in 1855–60; independent use of diazo-


  1. a combining form with the meaning “diazo group,” used in the formation of compound words: diazomethane.
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Also especially before a vowel, diaz-.

Origin of diazo-

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for diazo

Historical Examples

  • It is usually desirable to keep the solutions cool with ice, owing to the very unstable nature of the diazo compounds produced.

    Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8


  • The dyed colour here plays the part of a phenol or amine, and reacts with the diazo compound to produce a new colour.

  • For this purpose it is usually only necessary to prepare a solution containing the diazo compound.

  • Diazo compounds are therefore important intermediate substances in the manufacture of azo dyes.

  • The diazo compounds formed on the fibre are not very stable bodies.

British Dictionary definitions for diazo


  1. of, consisting of, or containing the divalent group, =N:N, or the divalent group, -N:N-diazo compound See also azo
  2. Also: dyeline of or relating to the reproduction of documents using the bleaching action of ultraviolet radiation on diazonium salts
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noun plural -os or -oes
  1. a document produced by this method
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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