Webster's English Dictionary

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uncle

un.cle \'*n-k*l\ n [ME, fr. OF, fr. L avunculus mother's brother; akin to 
   OE e-am u]ncle, OIr aue grandson, L avus grandfather 1a: the brother of 
   one's father or mother  1b: the husband of one's aunt  2: one who helps, 
   advises, or encourages  slang  3: PAWNBROKER