Acetophenone

\Ac`e*to*phe"none\, n. [Acetic + phenyl + one.] (Chem.) A crystalline ketone, CH3COC6H5, which may be obtained by the dry distillation of a mixture of the calcium salts of acetic and benzoic acids. It is used as a hypnotic under the name of hypnone.

 
Source: Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.