The Collaborative International Dictionary of English v.0.48:

Yarn \Yarn\, n. [OE. yarn, [yogh]arn, AS. gearn; akin to D.
   garen, G., OHG., Icel., Sw., & Dan. garn; of uncertain
   origin. Cf. Cord.]
   [1913 Webster]
   1. Spun wool; woolen thread; also, thread of other material,
      as of cotton, flax, hemp, or silk; material spun and
      prepared for use in weaving, knitting, manufacturing
      sewing thread, or the like.
      [1913 Webster]

   2. (Rope Making) One of the threads of which the strands of a
      rope are composed.
      [1913 Webster]

   3. A story told by a sailor for the amusement of his
      companions; a story or tale; as, to spin a yarn. [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

yarn
    n 1: the act of giving an account describing incidents or a
         course of events; "his narration was hesitant" [syn:
         narration, recital, yarn]
    2: a fine cord of twisted fibers (of cotton or silk or wool or
       nylon etc.) used in sewing and weaving [syn: thread,
       yarn]
    v 1: tell or spin a yarn

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "yarn":
   account, anecdotage, anecdote, belly laugh, blague, blue story,
   braid, brail, cable, causerie, chat, chin, chronicle,
   cock-and-bull story, colloque, cord, dirty joke, dirty story,
   double entendre, epic, epos, ethnic joke, exaggeration, fable,
   fabrication, fairy tale, falsehood, falsity, farfetched story,
   farrago, fib, fiction, fish story, flam, flimflam, fun,
   funny story, gag, ghost story, good one, good story, half-truth,
   howler, jape, jest, jestbook, joke, laugh, legal fiction, lie,
   ligament, ligation, ligature, line, little white lie, mendacity,
   narration, narrative, panic, pious fiction, play, point,
   prevarication, prose, rap, rib tickler, riot, rope, saga, scream,
   sick joke, sidesplitter, sight gag, slight stretching, sport,
   spun yarn, story, strand, string, tale, talk, tall story,
   tall tale, taradiddle, tendon, thong, thread, trumped-up story,
   twine, twist, untruth, visit, visual joke, wheeze, white lie,
   whopper, wire, wow



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

YARN
       Yet Another Resource Negotiator (Hadoop)


Easton's 1897 Bible Dictionary:

Yarn
   Found only in 1 Kings 10:28, 2 Chr. 1:16. The Heb. word mikveh,
   i.e., "a stringing together," so rendered, rather signifies a
   host, or company, or a string of horses. The Authorized Version
   has: "And Solomon had horses brought out of Egypt, and linen
   yarn: the king's merchants received the linen yarn at a price;"
   but the Revised Version correctly renders: "And the horses which
   Solomon had were brought out of Egypt; the king's merchants
   received them in droves, each drove at a price."