n. Methylenedioxymethamphetamine, a drug designed to have the effects of amphetamines but originally synthesized to avoid the drug laws; it is now a controlled substance. It is informally called ecstasy. It is used by some abusively and illegally without a prescription. [ acronym ] Syn. -- methylenedioxymethamphetamine, Adam, ecstasy. [ WordNet 1.5 +PJC ]