The Collaborative International Dictionary of English v.0.48:

Bran \Bran\, n. [OE. bren, bran, OF. bren, F. bran, from Celtic;
   cf. Armor. brenn, Ir. bran, bran, chaff.]
   1. The broken coat of the seed of wheat, rye, or other cereal
      grain, separated from the flour or meal by sifting or
      bolting; the coarse, chaffy part of ground grain.
      [1913 Webster]

   2. (Zool.) The European carrion crow.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bran
    n 1: broken husks of the seeds of cereal grains that are
         separated from the flour by sifting
    2: food prepared from the husks of cereal grains