aril

from WordNet (r) 3.0 (2006)

aril
    n 1: fleshy and usually brightly colored cover of some seeds
         that develops from the ovule stalk and partially or
         entirely envelopes the seed

from The Collaborative International Dictionary of English v.0.48

Aril \Ar"il\, Arillus \A*ril"lus\, n. [From LL. arilli dry
   grapes, perh. fr. L. aridus dry: cf. F,. arille.] (Bot.)
   A exterior covering, forming a false coat or appendage to a
   seed, as the loose, transparent bag inclosing the seed of the
   white water lily. The mace of the nutmeg is also an aril.
   --Gray.
   [1913 Webster] Arllated
   Arillate