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|Noun||1.||mephobarbital - a long-acting crystalline barbiturate (trade name Mebaral) used as a sedative and as an anticonvulsant in the treatment of epilepsy|
anticonvulsant, anticonvulsant drug, antiepileptic, antiepileptic drug - a drug used to treat or prevent convulsions (as in epilepsy)
barbiturate - organic compound having powerful soporific effect; overdose can be fatal