ar·il /ˈærəl/
假種皮
Ar·il A·ril·lus, n. 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.
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aril
n : fleshy and usually brightly colored cover of some seeds that
develops from the ovule stalk and partially or entirely
envelopes the seed