Uncle

from WordNet (r) 3.0 (2006)
uncle
    n 1: the brother of your father or mother; the husband of your
         aunt [ant: {aunt}, {auntie}, {aunty}]
    2: a source of help and advice and encouragement; "he played
       uncle to lonely students"
    
from The Collaborative International Dictionary of English v.0.48
Uncle \Un"cle\, n. [OE. uncle, OF. oncle, uncle, F. oncle, fr.
   L. avunculus a maternal uncle, dim. of avus a grandfather;
   akin to Lith. avynas uncle, Goth. aw? grandmother, Icel.
   [=a]i great grandfather.]
   1. The brother of one's father or mother; also applied to an
      aunt's husband; -- the correlative of aunt in sex, and of
      nephew and niece in relationship.
      [1913 Webster]

   2. A pawnbroker. [Slang] --Thackeray.
      [1913 Webster]

   3. An eldery man; -- used chiefly as a kindly or familiar
      appellation, esp. (Southern U. S.) for a worthy old negro;
      as, "Uncle Remus." [Colloq.]

            Plain old uncle as he [Socrates] was, with his great
            ears, -- an immense talker.           --Emerson.
      [Webster 1913 Suppl.]

   {My uncle}, a pawnbroker. [Slang]

   {Uncle Sam}, a humorous appellation given to the United
      States Government. See {Uncle Sam}, in Dictionary of Noted
      Names in Fiction.
      [1913 Webster]
    
from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)
UNCLE
       Unix Net for Computer security in Law Enforcement (org., USA,
Unix), "U.N.C.L.E."
       
    
from Moby Thesaurus II by Grady Ward, 1.0
43 Moby Thesaurus words for "uncle":
      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,
      niece, nuncle, nunks, nunky, second cousin, sis, sissy, sister,
      sister-german, sistern, son, stepbrother, stepsister, unc, uncs,
      uterine brother

    

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