The Collaborative International Dictionary of English v.0.48:

Discure \Dis*cure"\, v. t. [See Discover.]
   To discover; to reveal; to discoure. [Obs.]
   [1913 Webster]

         I will, if please you it discure, assay
         To ease you of that ill, so wisely as I may. --Spenser.
   [1913 Webster]