methylenedioxybenzylamphetamine /ˌmɛθəˌliːn daɪˈɑːksi ˌbɛnzəl æmˈfɛtəˌmiːn/ noun1 •A synthetic organic chemical related to amphetamines. It has a benzene ring, a methylenedioxy group, and an amine side chain, but it is poorly studied and appears to have little psychoactive effect compared to compounds like MDA or MDMA. formsmethylenedioxybenzylamphetamines