NDMA 
(ĕn′dē′ĕm′ā)
(ĕn′dē′ĕm′ā)n.
A highly toxic, carcinogenic nitrosamine, C2H6N2O, that occurs in tobacco smoke and certain foods and is sometimes found as a contaminant in drinking water. Also called dimethylnitrosamine.
[n(itroso)d(i)m(ethyl)a(mine) : nitroso-, containing the group NO attached to an organic moeity (from Latin nitrōsus, full of natron (taken as "full of nitrates" since natron and potassium nitrate were often confused in medieval science ); see NITROSAMINE) + DI-1 + METHYL + -AMINE.]