The Collaborative International Dictionary of English v.0.48:

decore \de*core"\ (d[-e]*k[=o]r"), v. t. [Cf. F. d['e]corer. See
   Decorate.]
   To decorate; to beautify. [Obs.]
   [1913 Webster]

         To decore and beautify the house of God. --E. Hall.
   [1913 Webster]