Source : Webster's Revised Unabridged Dictionary (1913)

Silhouette \Sil`hou*ette"\, n. [F.; -- so called from Etienne de
   Silhoutte, a French minister of finance in 1759, whise
   diversion it was to make such portraits on the walls of his
   apartments.]
   A representation of the outlines of an object filled in with
   a black color; a profile portrait in black, such as a shadow
   appears to be.

Silhouette \Sil`hou*ette"\, v. t.
   To represent by a silhouette; to project upon a background,
   so as to be like a silhouette. [Recent]

         A flock of roasting vultures silhouetted on the sky.
                                                  --The Century.

Source : WordNet®

silhouette
     n 1: an outline of a solid object (as cast by its shadow)
     2: a drawing of the outline of an object; filled in with some
        uniform color
     v 1: project on a background, such as a screen, like a silhouette
     2: represent by a silhouette