The Collaborative International Dictionary of English v.0.48:

Granary \Gran"a*ry\, n.; pl. Granaries. [L. granarium, fr.
   granum grain. See Garner.]
   1. A storehouse or repository for grain, esp. after it is
      thrashed or husked; a cornhouse.
      [1913 Webster]

   2. Hence: (Fig.), A region fertile in grain; in this sense,
      equivalent to breadbasket, used figuratively; as,
      Ukraine, the granary of the Soviet Union.
      [1913 Webster +PJC]

            The exhaustless granary of a world.   --Thomson.
      [1913 Webster]