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

1855–60; independent use of diazo-

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

di-1 + azo-

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
diazo (daɪˈeɪzəʊ)
1.  See also azo of, consisting of, or containing the divalent group, =N:N, or the divalent group, -N:N-: diazo compound
2.  Also: dyeline of or relating to the reproduction of documents using the bleaching action of ultraviolet radiation on diazonium salts
n , -os, -oes
3.  a document produced by this method

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Example sentences
Organic amides react with azo and diazo compounds to generate toxic gases.
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