Source : Webster's Revised Unabridged Dictionary (1913)

Incrust \In*crust"\, v. t. [imp. & p. p. {Incrusted}; p. pr. &
   vb. n. {Incrusting}.] [L. incrustare; pref. in- in + crustare
   to cover with a crust: cf. F. incruster. See {Crust}.]
   [Written also {encrust}.]
   1. To cover or line with a crust, or hard coat; to form a
      crust on the surface of; as, iron incrusted with rust; a
      vessel incrusted with salt; a sweetmeat incrusted with
      sugar.

            And by the frost refin'd the whiter snow, Incrusted
            hard.                                 --Thomson.

   2. (Fine Arts) To inlay into, as a piece of carving or other
      ornamental object.

Source : WordNet®

incrust
     v 1: decorate or cover lavishly with gems [syn: {encrust}, {beset}]
     2: cover or coat with a crust [syn: {encrust}]
     3: form a crust or a hard layer [syn: {encrust}]