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Definition of Valium
1. Noun. A tranquilizer (trade name Valium) used to relieve anxiety and relax muscles; acts by enhancing the inhibitory actions of the neurotransmitter GABA; can also be used as an anticonvulsant drug in cases of nerve agent poisoning.
Definition of Valium
1. Noun. A drug, now known as diazepam ¹
¹ Source: wiktionary.com