dimercaprolPronunciation: /ˌdʌɪməˈkaprɒl/Definition of dimercaprol noun [mass noun] Chemistry a colourless, oily liquid with an unpleasant smell, used as an antidote for poisoning by mercury, arsenic, lead, and other heavy metals. Alternative name: 2,3,-dimercapto-1-propanol; chemical formula: CH2(SH)CH(SH)CH2OH Origin: 1940s: from elements of the systematic name (see above)dimercaprol in other Oxford dictionaries Definition of dimercaprol in the US English dictionary