acetophenone

noun

ace·to·phe·none | \ ˌas-ə-tō-fə-ˈnōn

, ə-ˈsēt-ō-

Medical Definition of acetophenone

: a colorless liquid ketone CH₃COC₆H₅ formerly used as a hypnotic but now used chiefly in perfumery

— called also hypnone