Hypertext Webster Gateway: "aril"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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 or the
white water lily. The mace of the nutmeg is also an aril.
--Gray.
From WordNet (r) 1.7 (wn)
aril
n : fleshy and usually brightly colored cover of some seeds that
develops from the ovule stalk and partially or entirely
envelopes the seed
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