The Collaborative International Dictionary of English v.0.48:

Overspread \O`ver*spread"\, v. t. [imp. & p. p. Overspread; p.
   pr. & vb. n. Overspreading.] [AS. oferspr[=ae]dan.]
   To spread over; to cover; as, the deluge overspread the
   earth. --Chaucer.
   [1913 Webster]

         Those nations of the North
         Which overspread the world.              --Drayton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Overspread \O`ver*spread"\, v. i.
   To be spread or scattered over.
   [1913 Webster]

WordNet (r) 3.0 (2006):

overspread
    v 1: spread across or over; "A big oil spot spread across the
         water" [syn: spread, overspread]