Aril

n.

1.

(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.

Noun

1.

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

plant part, plant structure