The Collaborative International Dictionary of English v.0.48:

Stover \Sto"ver\ (st[=o]"v[~e]r), n. [OE. estoveir, estovoir,
   necessity, provisions, properly an inf., "to be necessary."
   Cf. Estovers.]
   Fodder for cattle, especially straw or coarse hay.
   [1913 Webster]

         Where live nibbling sheep,
         And flat meads thatched with stover them to keep.
                                                  --Shak.
   [1913 Webster]

         Thresh barley as yet but as need shall require,
         Fresh threshed for stover thy cattle desire. --Tusser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stover
    n 1: the dried stalks and leaves of a field crop (especially
         corn) used as animal fodder after the grain has been
         harvested