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Medical Definition of Orthotolidine
1. O-Tolidine; 3,3'-dimethylbenzidine;in the presence of peroxidase, orthotolidine (like benzidine) is oxidised to a blue colour; since haemoglobin behaves like a peroxidase, orthotolidine has been used as an in vitro aid for the detection of occult blood in faeces. (05 Mar 2000)