“+ noun
Etymology: tolylene + diamine
: any of six isomeric crystalline bases CH 3 C 6 H 3 (NH 2 ) 2 derived from toluene of which some are used as dye intermediates: as
a. : an isomer obtained by reduction of dinitrotoluene (sense a); toluene-2,4-diamine — called also meta-tolylenediamine
b. : an isomer obtained by reduction of aminoazo-toluene; toluene-2,5-diamine — called also para-tolylenediamine ; see safranine b