disazo-Chem.|dɪsˈæzəʊ|[f.Gr. δίς twice + azo-.]A combining form used in organic chemistry to denote the presence in the molecule of a compound of two azo groups. Also used attrib. as disazo.1886E. F. Smith tr.von Richter's Chem. Carbon Compounds 465 Such compounds can also be obtained by a second introduction of two molecules of a diazo-compound into phenols.., and are called disazo-derivatives.1891Roscoe & Schorlemmer Treat.Chem. (ed. 2) III. iii. 353 Disazobenzene..is obtained from the corresponding amidodisazobenzene..by diazotizing and boiling with alcohol.1913Bloxam & Lewis Chem. (ed. 10) 719 Disazo-dyestuffs..contain the ·N:N· group twice, and are of three kinds.1930E. Fyleman tr.Curtis's Artificial Org. Pigments i. 6 In the patent literature a number of disazo-dyestuffs are also mentioned, but none of these have attained any importance.1966Millar & Springall Sidgwick's Org.Chem. Nitrogen (ed. 3) xvii. 588 The azo dyes form the largest class of organic dyes... Monoazo, disazo, trisazo, and polyazo dyes are distinguished.