Source : Webster's Revised Unabridged Dictionary (1913)

Guise \Guise\, n. [OE. guise, gise, way, manner, F. guise, fr.
   OHG. w[=i]sa, G. weise. See {Wise}, n.]
   1. Customary way of speaking or acting; custom; fashion;
      manner; behavior; mien; mode; practice; -- often used
      formerly in such phrases as: at his own guise; that is, in
      his own fashion, to suit himself. --Chaucer.

            The swain replied, ``It never was our guise To
            slight the poor, or aught humane despise.'' --Pope.

   2. External appearance in manner or dress; appropriate
      indication or expression; garb; shape.

            As then the guise was for each gentle swain.
                                                  --Spenser.

            A . . . specter, in a far more terrific guise than
            any which ever yet have overpowered the imagination.
                                                  --Burke.

   3. Cover; cloak; as, under the guise of patriotism.

Source : WordNet®

guise
     n : an artful or simulated semblance; "under the guise of
         friendship he betrayed them" [syn: {pretense}, {pretence},
          {pretext}]