The Collaborative International Dictionary of English v.0.48:

Disappear \Dis`ap*pear"\, v. i. [imp. & p. p. Disappeared; p.
   pr. & vb. n. Disappearing.]
   1. To cease to appear or to be perceived; to pass from view,
      gradually or suddenly; to vanish; to be no longer seen;
      as, darkness disappears at the approach of light; a ship
      disappears as she sails from port.
      [1913 Webster]

   2. To cease to be or exist; as, the epidemic has disappeared.
      [1913 Webster]