One of the mysteries of the English language finally explained.
An anticonvulsant drug chemically related (and partially metabolized) to phenobarbital, used in the treatment of epilepsy and essential (idiopathic) tremor. [Chemical name: 5-ethyl-5-phenylhexahydropyrimidine-4,6-dione; C12H14N2O2. A trademark for this drug is Mysoline.]
1950s; earliest use found in The British Medical Journal. From p- + -rimid- + -one.
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