episperm

from WordNet (r) 3.0 (2006)

episperm
    n 1: protective outer layer of seeds of flowering plants [syn:
         {testa}, {episperm}, {seed coat}]

from The Collaborative International Dictionary of English v.0.48

Episperm \Ep"i*sperm\, n. [Pref. epi- + Gr. ? seed: cf. F.
   ['e]pisperme.] (Bot.)
   The skin or coat of a seed, especially the outer coat. See
   {Testa}.
   [1913 Webster]