The Collaborative International Dictionary of English v.0.48:

Deforest \De*for"est\, v. t.
   To clear of forests; to disforest. --U. S. Agric. Reports.
   [1913 Webster]

WordNet (r) 3.0 (2006):

deforest
    v 1: remove the trees from; "The landscape was deforested by the
         enemy attacks" [syn: deforest, disforest,
         disafforest]

U.S. Gazetteer Places (2000):

DeForest, WI -- U.S. village in Wisconsin
   Population (2000):    7368
   Housing Units (2000): 2761
   Land area (2000):     4.830617 sq. miles (12.511240 sq. km)
   Water area (2000):    0.052474 sq. miles (0.135906 sq. km)
   Total area (2000):    4.883091 sq. miles (12.647146 sq. km)
   FIPS code:            19350
   Located within:       Wisconsin (WI), FIPS 55
   Location:             43.245751 N, 89.345869 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    DeForest, WI
    DeForest