malolacticPronunciation: /ˌmalə(ʊ)ˈlaktɪk/Definition of malolactic adjective of or denoting bacterial fermentation which converts malic acid to lactic acid, especially as a secondary process used to reduce the acidity of some wines: malolactic fermentation is essential in poor years when the grapes are not fully ripe noun [mass noun] malolactic fermentation: most Champagnes undergo malolacticmalolactic in other Oxford dictionaries Definition of malolactic in the US English dictionary