Source : Webster's Revised Unabridged Dictionary (1913)

Stopper \Stop"per\, n.
   1. One who stops, closes, shuts, or hinders; that which stops
      or obstructs; that which closes or fills a vent or hole in
      a vessel.

   2. (Naut.) A short piece of rope having a knot at one or both
      ends, with a lanyard under the knot, -- used to secure
      something. --Totten.

   3. (Bot.) A name to several trees of the genus Eugenia, found
      in Florida and the West Indies; as, the red stopper. See
      {Eugenia}. --C. S. Sargent.

   {Ring stopper} (Naut.), a short rope or chain passing through
      the anchor ring, to secure the anchor to the cathead.

   {Stopper bolt} (Naut.), a large ringbolt in a ship's deck, to
      which the deck stoppers are hooked.

Stopper \Stop"per\, v. t. [imp. & p. p. {Stoppered}; p. pr. &
   vb. n. {Stoppering}.]
   To close or secure with a stopper.

Source : WordNet®

stopper
     n 1: blockage consisting of an object designed to fill a hole
          tightly [syn: {plug}, {stopple}]
     2: an act so striking or impressive that the show must be
        delayed until the audience quiets down [syn: {show-stopper},
         {showstopper}]
     3: a remark to which there is no polite conversational reply
        [syn: {conversation stopper}]
     4: (bridge) a playing card with a value sufficiently high to
        insure taking a trick in a particular suit; "if my partner
        has a spade stopper I can bid no trump"
     v : close or secure with or as if with a stopper; "She stoppered
         the wine bottle"; "The mothers stoppered their babies'
         mouths with pacifiers" [syn: {stopple}]