The DICT Development Group

  Usufruct \U"su*fruct\ (?; 277), n. [L. usufructus, ususfructus,
     usus et fructus; usus use + fructus fruit.] (Law)
     The right of using and enjoying the profits of an estate or
     other thing belonging to another, without impairing the
     substance. --Burrill.
     [1913 Webster]

  usufruct
      n 1: a legal right to use and derive profit from property
           belonging to someone else provided that the property itself
           is not injured in any way

  USUFRUCT, civil law. The right of enjoying a thing, the property of which is 
  vested in another, and to draw from the same all the profit, utility and 
  advantage which it may produce, provided it be without altering the 
  substance of the thing. 
       2. The obligation of not altering the substance of the thing, however, 
  takes place only in the case of a complete usufruct. 
       3. Usufructs are of two kinds; perfect and imperfect. Perfect usufruct, 
  which is of things which the usufructuary can enjoy without altering their 
  substance, though their substance may be diminished or deteriorated 
  naturally by time or by the use to which they are applied; as a house, a 
  piece of land, animals, furniture and other movable effects. Imperfect or 
  quasi usufruct, which is of things which would be useless to the 
  usufructuary if be did not consume and expend them, or change the substance 
  of them, as money, grain, liquors. Civ. Code of Louis. art. 525, et seq.; 1 
  Browne's Civ. Law, 184; Poth. Tr. du Douaire, n. 194; Ayl. Pand. 319; Poth. 
  Pand. tom. 6, p. 91; Lecons El. du Dr. Civ. Rom. 414 Inst. lib. 2, t. 4; 
  Dig. lib. 7, t. 1, 1. 1 Code, lib. 3, t. 33; 1 Bouv. Inst. Theolo. pg. 1, c. 
  1, art. 2, p. 76.