WordNet (r) 3.0 (2006):

Valium
    n 1: 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 [syn:
         diazepam, Valium]