clonazepam UK /ˌkləʊˈneɪ.zɪ.pam/US /kləˈnæz.əˌpæm/ noun1 •A benzodiazepine with potent anticonvulsant used especially in the treatment of epilepsy and other seizure disorders; C₁₅H₁₀ClN₃O₃. It is the generic name for Klonopin. It is a derivative of nitrazepam.