DEFOREST Meaning of DEFOREST in English (ˈ)dē+ transitive verbEtymology: de- + forest (n.): to clear of forests : remove trees from• de·forestation (|)dē+ noun -s• de·forester (ˈ)dē+ noun -s Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012