\Rub"ber\, n.
1. One who, or that which, rubs. Specifically:
   (a) An instrument or thing used in rubbing, polishing, or
       cleaning.
   (b) A coarse file, or the rough part of a file.
   (c) A whetstone; a rubstone.
   (d) An eraser, usually made of caoutchouc.
   (e) The cushion of an electrical machine.
   (f) One who performs massage, especially in a Turkish
       bath.
   (g) Something that chafes or annoys; hence, something that
       grates on the feelings; a sarcasm; a rub. --Thackeray.
2. In some games, as whist, the odd game, as the third or the
   fifth, when there is a tie between the players; as, to
   play the rubber; also, a contest determined by the winning
   of two out of three games; as, to play a rubber of whist.
   --Beaconsfield. ``A rubber of cribbage.'' --Dickens.
3. India rubber; caoutchouc.
4. An overshoe made of India rubber. [Colloq.]
{Antimony rubber}, an elastic durable variety of vulcanized
   caoutchouc of a red color. It contains antimony sulphide
   as an important constituent.
{Hard rubber}, a kind of vulcanized caoutchouc which nearly
   resembles horn in texture, rigidity, etc.
{India rubber}, caoutchouc. See {Caoutchouc}.
{Rubber cloth}, cloth covered with caoutchouc for excluding
   water or moisture.
{Rubber dam} (Dentistry), a shield of thin sheet rubber
   clasped around a tooth to exclude saliva from the tooth.