eth′yl bu′tyrate,[Chem.]a colorless, volatile, nontoxic liquid having the odor of pineapple, C6H12O2, used chiefly in flavoring extracts, and in the manufacture of perfumes and sprays. Also called eth′yl bu′tan•o•ate(byo̅o̅′tan ō āt′, byo̅o̅ tan′).USA pronunciation