|bī+ noun
( -s )
Etymology: bi- (I) + anisidine
: any of several isomeric compounds C 14 H 16 N 2 O 2 the molecule of which is a doubled anisidine molecule ; especially : the white crystalline ortho isomer derived from benzidine, made by reducing ortho- nitro-anisole, and used as an intermediate for many azo dyes — called also dianisidine