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di·a·zo·ni·um | \ ˌdī-ə-ˈzō-nē-əm 
\
\Definition of diazonium
: the monovalent cation N2+ that is composed of two nitrogen atoms united to carbon in an organic radical and that usually exists in salts used in the manufacture of azo dyes
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diazonium
noundi·a·zo·ni·um | \ ˌdī-ə-ˈzō-nē-əm \
\Medical Definition of diazonium
: the monovalent cation N2+ that is composed of two nitrogen atoms united to carbon in an organic radical and that usually exists in salts used in the manufacture of azo dyes
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The first known use of diazonium was in 1895
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