ˈseməˌdīn, -_də̇n noun
( -s )
Etymology: International Scientific Vocabulary semi- + benzi dine
: any of a group of bases that are ortho and para amino derivatives of diphenylamine and are usually formed by a molecular rearrangement of hydrazo compounds (as p -RC 6 H 4 NHNHC 6 H 5 → p,p′ -RC 6 H 4 NHC 6 H 4 NH 2 )