defogger Syllabification: (de·fog·ger)Pronunciation: /dēˈfôgər, -ˈfä-/Translate defogger | into Spanish Definition of defogger noun a device on a vehicle that removes condensation from the windshield by directing a jet of air onto it. Derivatives defog verb defogger in other Oxford dictionaries Definition of defogger in the British & World English dictionary