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

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occurring twice a year or every two years

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