The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]
   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.
      [1913 Webster]

            And by the frost refin'd the whiter snow,
            Incrusted hard.                       --Thomson.
      [1913 Webster]

   2. (Fine Arts) To inlay into, as a piece of carving or other
      ornamental object.
      [1913 Webster]