| diethylmalonylurea | (noun) a barbiturate used as a hypnotic | Synonyms: barbital, barbitone, diethylbarbituric acid, veronal |
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| malonylurea | (noun) a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs | Synonyms: barbituric acid |
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| sulfonylurea | (noun) antidiabetic consisting of any of several drugs that reduce the level of glucose in the blood; used to treat diabetes mellitus | - |
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| urea | (noun) the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics | Synonyms: carbamide |
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