perisperm

from WordNet (r) 3.0 (2006)

perisperm
    n 1: the nutritive tissue outside the sac containing the embryo
         in some seeds

from The Collaborative International Dictionary of English v.0.48

Perisperm \Per"i*sperm\, n. [F. p['e]risperme. See {Peri-}, and
   {Sperm}.] (Bot.)
   The albumen of a seed, especially that portion which is
   formed outside of the embryo sac. -- {Per`i*sper"mic}, a.
   [1913 Webster] Perispheric