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

Socket \Sock"et\, n. [OE. soket, a dim. through OF. fr. L.
   soccus. See {Sock} a covering for the foot.]
   1. An opening into which anything is fitted; any hollow thing
      or place which receives and holds something else; as, the
      sockets of the teeth.

            His eyeballs in their hollow sockets sink. --Dryden.

   2. Especially, the hollow tube or place in which a candle is
      fixed in the candlestick.

            And in the sockets oily bubbles dance. --Dryden.

   {Socket bolt} (Mach.), a bolt that passes through a thimble
      that is placed between the parts connected by the bolt.

   {Socket chisel}. Same as {Framing chisel}. See under
      {Framing}.

   {Socket pipe}, a pipe with an expansion at one end to receive
      the end of a connecting pipe.

   {Socket pole}, a pole armed with iron fixed on by means of a
      socket, and used to propel boats, etc. [U.S.]

   {Socket wrench}, a wrench consisting of a socket at the end
      of a shank or rod, for turning a nut, bolthead, etc., in a
      narrow or deep recess.

资料来源 : WordNet®

socket wrench
     n : a wrench with a handle onto which sockets of different sizes
         can be fitted