The Collaborative International Dictionary of English v.0.48:

Breadstuff \Bread"stuff\, n.
   Grain, flour, or meal of which bread is made.
   [1913 Webster]

WordNet (r) 3.0 (2006):

breadstuff
    n 1: food made from dough of flour or meal and usually raised
         with yeast or baking powder and then baked [syn: bread,
         breadstuff, staff of life]
    2: flour or meal or grain used in baking bread