deforest Syllabification: (de·for·est)Pronunciation: /dēˈfôrist, -ˈfär-/Definition of deforest verb [with object] clear (an area) of forests or trees. Derivatives deforestationPronunciation: /dēˌfôrəˈstāSHən, -ˌfär-/ noun deforest in other Oxford dictionaries Definition of deforest in the British & World English dictionary