[Short for TRYPANOSOMA.] In trypan red [rendering Ger. trypanrot], a drug used in cases of trypanosomiasis.
1905. Brit. Med. Jrnl., 27 May, 1140. The treatment of trypan red in various trypanosomic diseases.
1907. Daily News, 31 Aug., 4. According to The Hospital, the correct name for trypan red, which is now used in cases of trypanosomiasis, is sodium-ortho-benzidine-mono-sulphoacid-diazo-b-2-naphthylamine-3.6-sulphoacid!