Ar″il (�), ‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.