The Collaborative International Dictionary of English v.0.48:

Forehead \Fore"head\ (?; 277), n.
   1. The front of that part of the head which incloses the
      brain; that part of the face above the eyes; the brow.
      [1913 Webster]

   2. The aspect or countenance; assurance.
      [1913 Webster]

            To look with forehead bold and big enough
            Upon the power and puissance of the king. --Shak.
      [1913 Webster]

   3. The front or fore part of anything.
      [1913 Webster]

            Flames in the forehead of the morning sky. --Milton.
      [1913 Webster]

            So rich advantage of a promised glory
            As smiles upon the forehead of this action. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

forehead
    n 1: the part of the face above the eyes [syn: brow,
         forehead]
    2: the large cranial bone forming the front part of the cranium:
       includes the upper part of the orbits [syn: frontal bone,
       os frontale, forehead]

Easton's 1897 Bible Dictionary:

Forehead
   The practice common among Oriental nations of colouring the
   forehead or impressing on it some distinctive mark as a sign of
   devotion to some deity is alluded to in Rev. 13:16, 17; 14:9;
   17:5; 20:4.

     The "jewel on thy forehead" mentioned in Ezek. 16:12 (R.V., "a
   ring upon thy nose") was in all probability the "nose-ring"
   (Isa. 3:21).

     In Ezek. 3:7 the word "impudent" is rightly rendered in the
   Revised Version "an hard forehead." (See also ver. 8, 9.)