a tranquilizer, CHClNO, that relieves anxiety: a hydrochloride derivative of this has similar properties and is the generic name for Librium, etc.
See chlordiazepoxide in American Heritage Dictionary 4
(klôrˌdī-ăzˌə-pŏkˈsīdˌ, klōrˌ-)
noun
A benzodiazepine drug, C16H14ClN3O, whose hydrochloride is used as an antianxiety drug and in the treatment of chronic alcoholism and alcohol withdrawal.