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A fleshy, usually brightly colored cover of a seed, usually arising from the funiculus.
[Medieval Latin arillus, grape seed, from a Romance source akin to Italian arillo, seed coat, from Vulgar Latin *arēnula, grain of sand, from diminutive of Latin arēna, sand; see arena.]
ar′il·late′ (-lāt′, -lĭt) adj.
(Botany) an appendage on certain seeds, such as those of the yew and nutmeg, developed from or near the funicle of the ovule and often brightly coloured and fleshy
[C18: from New Latin arillus, from Medieval Latin arilli raisins, pips of grapes]
a usu. fleshy appendage or covering of certain seeds, as of the bittersweet, Celastrus scandens, or of the nutmeg.
[1785–95; < New Latin arillus, Medieval Latin: grape seed]
ar′il•late` (-ˌleɪt, -lɪt) adj.