(|)trī|fen ə l, -fēn-+ noun
Etymology: triphenyl- + formazan
: a red insoluble compound C 6 H 5 N . NC(C 6 H 5 ) . NNHC 6 H 5 obtained by reaction of benzaldehyde phenylhydrazone with benzenediazonium chloride or by reduction of triphenyltetrazolium chloride