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azo-dyes
azo-dyes n. 
/ˈazəʊdʌɪz/, /ˈæzoʊˌdaɪz/ a group of coal-tar dyes.
Brit. /ˈeɪzəʊdʌɪz/
, /ˈeɪzəʊdʌɪz//ˈazəʊdʌɪz/U.S. /ˈeɪzoʊˌdaɪz/
, /ˈeɪzoʊˌdaɪz//ˈæzoʊˌdaɪz/ΚΠ
1884 Jrnl. Chem. Soc. 46 237 The preparation of azo-dyes from the trisulphonic acids of β-naphthol.
1894 G. M. Gould Illustr. Dict. Med. Azo-dyes, a well defined group of the coal-tar colors, all containing the diatomic group N N, bound on either side to a benzene radical.
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