Webster's English Dictionary

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aril

ar.il \'ar-*l\ \'ar-*ld\ \'ar-*-.la-t\ n [prob. fr. NL arillus, fr. ML, 
   raisin, grape seed] : an exterior covering or appendage of some seeds that 
   develops after fert ilization as an outgrowth from the ovule stalk - 
   ar.iled aj