Etymology
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Valium (n.)

1961, proprietary name (Hoffmann-La Roche Inc., Nutley, N.J.) of diazepam (reg. U.S.), of unknown origin.

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Definitions of Valium

Valium (n.)
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;
Synonyms: diazepam
From wordnet.princeton.edu