noun. a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States.
1. Noun, singular or mass MDMA is the abbreviation for 3-4 methylenedioxymethamphetamine**, which is commonly known as Ecstasy, E, XTC, Clarity or the Love Drug.
