niece

from WordNet (r) 3.0 (2006)
niece
    n 1: a daughter of your brother or sister [ant: {nephew}]
    
from The Collaborative International Dictionary of English v.0.48
Niece \Niece\ (n[=e]s), n. [OE. nece, F. ni[`e]ce, LL. neptia,
   for L. neptis a granddaughter, niece, akin to nepos. See
   {Nephew}.]
   1. A relative, in general; especially, a descendant, whether
      male or female; a granddaughter or a grandson. [Obs.] --B.
      Jonson. Wyclif. Shak.
      [1913 Webster]

   2. Especially: A daughter of one's brother or sister, or of
      one's brother-in-law or sister-in-law. In modern English,
      this is the primary meaning.
      [1913 Webster]
    
from Bouvier's Law Dictionary, Revised 6th Ed (1856)
NIECE, domestic relations: The daughter of a person's brother or sister. 
Amb. 514; 1 Jacob's Ch. R. 207. 
    
from Moby Thesaurus II by Grady Ward, 1.0
43 Moby Thesaurus words for "niece":
      aunt, auntie, blood brother, brethren, brother, bub, bubba, bud,
      buddy, country cousin, cousin, cousin once removed,
      cousin twice removed, daughter, father, first cousin,
      foster brother, frater, grandnephew, grandniece, granduncle,
      great-aunt, great-uncle, half brother, kid brother, mother, nephew,
      nuncle, nunks, nunky, second cousin, sis, sissy, sister,
      sister-german, sistern, son, stepbrother, stepsister, unc, uncle,
      uncs, uterine brother

    

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