tmb

/T IY1 EH1 M B IY1/
noun
  1. 1

    (organic chemistry) Initialism of tetramethylbenzidine. [(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]

  2. 2

    (organic chemistry) Initialism of trimethylborane.