aleurone

from WordNet (r) 3.0 (2006)

aleurone
    n 1: granular protein in outermost layer of endosperm of many
         seeds or cereal grains

from The Collaborative International Dictionary of English v.0.48

Aleurone \A*leu"rone\, n. [Gr. ? flour.] (Bot.)
   An albuminoid substance which occurs in minute grains
   ("protein granules") in maturing seeds and tubers; --
   supposed to be a modification of protoplasm.
   [1913 Webster]