Webster's English Dictionary

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nephew

neph.ew \'nef-(.)yu:, chiefly Brit 'nev-\ n [ME nevew, fr. OF neveu, fr. L 
   nepot-, nepos grandson,]nephew; akin to OE nefa grandson, nephew, Skt 
   napa-t grandson 1a: a son of one's brother or sister or of one's 
   brother-in-law or sister-i n-law 1b: an illegitimate son of an ecclesiastic 
    obs  2: a lineal descendant; esp : GRANDSON