The Collaborative International Dictionary of English v.0.48:

Ensilage \En"si*lage\, n. [F.; pref. en- (L. in) + silo. See
   Silo.]
   1. The process of preserving fodder (such as cornstalks, rye,
      oats, millet, etc.) by compressing it while green and
      fresh in a pit or vat called a silo, where it is kept
      covered from the air; as, the ensilage of fodder.
      [1913 Webster]

   2. The fodder preserved in a silo.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ensilage \En"si*lage\, v. t. [imp. & p. p. Ensilaged; p. pr. &
   vb. n. Ensilaging.]
   To preserve in a silo; as, to ensilage cornstalks.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ensilage
    n 1: fodder harvested while green and kept succulent by partial
         fermentation as in a silo [syn: silage, ensilage]