The Collaborative International Dictionary of English v.0.48:

Spar \Spar\, v. t. [OE. sparren, AS. sparrian; akin to G.
   sperren, Icel. sperra; from the noun. [root]171. See Spara
   beam, bar.]
   1. To bolt; to bar. [Obs.] --Chaucer.
      [1913 Webster]

   2. To To supply or equip with spars, as a vessel.
      [1913 Webster]

   Note: A vessel equipped with spars that are too large or too
         small is said to be oversparred or undersparred.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

spar \spar\ (sp[aum]r), n. [AS. spaer in spaerst[=a]n
   chalkstone; akin to MHG. spar, G. sparkalk plaster.] (Min.)
   An old name for a nonmetallic mineral, usually cleavable and
   somewhat lustrous; as, calc spar, or calcite, fluor spar,
   etc. It was especially used in the case of the gangue
   minerals of a metalliferous vein.
   [1913 Webster]

   Blue spar, Cube spar, etc. See under Blue, Cube, etc.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spar \Spar\, v. i. [imp. & p. p. Sparred; p. pr. & vb. n.
   Sparring.] [Of uncertain origin; cf. OF. esparer to kick,
   F. ['e]parer, or Icel. sperra to stretch out the legs, to
   struggle.]
   1. To strike with the feet or spurs, as cocks do.
      [1913 Webster]

   2. To use the fists and arms scientifically in attack or
      defense; to contend or combat with the fists, as for
      exercise or amusement; to box.
      [1913 Webster]

            Made believe to spar at Paul with great science.
                                                  --Dickens.
      [1913 Webster]

   3. To contest in words; to wrangle. [Colloq.]
      [1913 Webster]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spar \Spar\, n. [OE. sparre; akin to D. spar, G. sparren, OHG.
   sparro, Dan. & Sw. sparre, Icel. sparri; of uncertain origin.
   [root]171. Cf. Spar, v. t. ]
   1. (Naut.) A general term any round piece of timber used as a
      mast, yard, boom, or gaff.
      [1913 Webster]

   2. (Arch.) Formerly, a piece of timber, in a general sense;
      -- still applied locally to rafters.
      [1913 Webster]

   3. The bar of a gate or door. [Obs.] --Chaucer.
      [1913 Webster]

   Spar buoy (Naut.), a buoy anchored by one end so that the
      other end rises above the surface of the water.

   Spar deck (Naut.), the upper deck of a vessel; especially,
      in a frigate, the deck which is continued in a straight
      line from the quarter-deck to the forecastle, and on which
      spare spars are usually placed. See under Deck.

   Spar torpedo (Naut.), a torpedo carried on the end of a
      spar usually projecting from the bow of a vessel, and
      intended to explode upon contact with an enemy's ships.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Spar \Spar\, n.
   1. A contest at sparring or boxing.
      [1913 Webster]

   2. A movement of offense or defense in boxing.
      [1913 Webster]

WordNet (r) 3.0 (2006):

spar
    n 1: any of various nonmetallic minerals (calcite or feldspar)
         that are light in color and transparent or translucent and
         cleavable
    2: a stout rounded pole of wood or metal used to support rigging
    3: making the motions of attack and defense with the fists and
       arms; a part of training for a boxer [syn: spar,
       sparring]
    v 1: furnish with spars
    2: fight with spurs; "the gamecocks were sparring"
    3: box lightly
    4: fight verbally; "They were sparring all night"

Moby Thesaurus II by Grady Ward, 1.0:

167 Moby Thesaurus words for "spar":
   Chinese boxing, altercate, argue, argufy, bandy words, bar,
   bare pole, battle, beam, bicker, boom, bout, bowsprit, box, boxing,
   boxing match, brawl, broil, bumpkin, cant hook, cavil, choplogic,
   clash, claw bar, close, close fighting, club, collide, combat,
   come to blows, contend, contest, crank, cross swords,
   crossjack yard, crosstree, crow, crowbar, cut and thrust, differ,
   discept, dispute, dolphin striker, duel, exchange blows, fence,
   feud, fight, fight a duel, fighting, fisticuffs, flite,
   flying jib boom, fore jack, fore-skysail mast, fore-skysail yard,
   fore-topgallant mast, fore-topgallant yard, fore-topmast, foremast,
   foreroyal mast, foreroyal yard, foreyard, gaff, give and take,
   give satisfaction, gooseneck, grapple, grapple with, handspike,
   hassle, have it out, have words, infighting, iron crow, jack,
   jib boom, jigger, jimmy, join issue, jostle, joust, king post,
   lazy jack, lever, limb, lock horns, logomachize, lower boom,
   main-royal mast, main-royal yard, main-skysail mast,
   main-topgallant mast, mainmast, marlinespike, mast, masthead,
   mix it up, mizzen, mizzen-royal mast, mizzenmast, moot, outrigger,
   peavey, pedal, pettifog, pinch bar, plead, pole, polemicize,
   polemize, prize, prizefight, prizefighting, pry, pugilism, quarrel,
   quibble, rassle, riot, ripping bar, run a tilt, savate, scramble,
   scrap, scuffle, set to, shadowboxing, skirmish, skysail yard,
   spanker boom, spanker gaff, spars, spat, spreader, sprit, squabble,
   stick, strive, struggle, tack bumpkin, take sides, the clinches,
   the fights, the ring, thrash out, thrust and parry, tiff, tilt,
   timber, topgallant mast, topgallant yard, topmast, tourney,
   treadle, tree, try conclusions, tussle, wage war, war,
   whisker boom, whisker pole, wrangle, wrecking bar, wrestle, yard,
   yardarm



The Free On-line Dictionary of Computing (30 December 2018):

SPAR

   Early system on Datatron 200 series.  Listed in CACM 2(5):16
   (May 1959).