adjective Chemistry.
of or derived from a diazonium compound.

1890–95; diaz- + -onium, as in ammonium

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World English Dictionary
diazonium (ˌdaɪəˈzəʊnɪəm)
(modifier) of, consisting of, or containing the group, Ar-N:N-, where Ar is an aryl group: diazonium group or radical; a diazonium compound
[C19: diazo + (amm)onium]

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Example sentences
Leukocytes: esterase cleaves an indoxyl ester, and the indoxyl reacts with a diazonium salt to produce a purple color.
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