| barbital | (n) a barbiturate used as a hypnotic, Syn. diethylbarbituric acid, veronal, diethylmalonylurea, barbitone |
| barbituric acid | (n) a white crystalline acid derived from pyrimidine; used in preparing barbiturate drugs, Syn. malonylurea |
| malonylurea | n. A white crystalline acid derived from pyrimidine; it is used in preparing barbiturate drugs. |