Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. To To supply or equip with spars, as a vessel.

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

Spar \Spar\, n. [AS. sp[ae]r in sp[ae]rst[=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.

   {Blue spar}, {Cube spar}, etc. See under {Blue}, {Cube}, etc.

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.

   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.

            Made believe to spar at Paul with great science.
                                                  --Dickens.

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

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

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

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

   {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.

Spar \Spar\, n.
   1. A contest at sparring or boxing.

   2. A movement of offense or defense in boxing.

Source : WordNet®

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: {sparring}]
     [also: {sparring}, {sparred}]

spar
     v 1: furnish with spars
     2: fight with spurs; "the gamecocks were sparring"
     3: box lightly
     4: fight verbally; "They were sparring all night"
     [also: {sparring}, {sparred}]

Source : Free On-Line Dictionary of Computing

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