tetramethylbenzidine

== English == === Etymology === From tetramethyl +‎ benzidine. === Noun === tetramethylbenzidine (plural tetramethylbenzidines) (organic chemistry) Any of several isomeric tetramethyl derivatives of benzidine, but especially 3,3’,5,5’-tetramethylbenzidine that is a chromogenic substrate used in immunohistochemistry