Rubber \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.]

Source: Webster's Revised Unabridged Dictionary (1913)