noun Pharmacology.

  1. a nonbarbiturate sedative-hypnotic substance, C16H14N2O, used to induce sleep: also widely used as an illicit drug.


  1. a nonbarbituate sedative drug used to treat stress and insomnia. Formula: C 16 H 14 N 2 O

n.hypnotic sedative drug, 1961, from meth(o)- + connecting particle -a- + qu(in)a(zo)lone. n.

  1. A potentially habit-forming drug used as a sedative and hypnotic.
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