ˈbenzəˌdēn, -_də̇n noun
( -s )
Etymology: probably from German benzidin, blend of benzin benzine and -id -ide
: a white or reddish gray crystalline base NH 2 C 6 H 4 C 6 H 4 NH 2 made usually by a series of reactions from nitrobenzene and used chiefly in making dyes (as Congo red), in chemical analysis, and in the detection of blood; 4,4′-biphenyl-diamine