资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

资料来源 : WordNet®

spar buoy
     n : a buoy resembling a vertical log