The Collaborative International Dictionary of English v.0.48:
Rubber \Rub"ber\, n.
1. One who, or that which, rubs. Specifically:
(a) An instrument or thing used in rubbing, polishing, or
(b) A coarse file, or the rough part of a file.
(c) A whetstone; a rubstone.
(d) An eraser, usually made of caoutchouc or a synthetic
(e) The cushion of an electrical machine.
(f) One who performs massage, especially in a Turkish
(g) Something that chafes or annoys; hence, something that
grates on the feelings; a sarcasm; a rub. --Thackeray.
2. In some games, as bridge or whist, the odd game, as the
third or the fifth, which decides the winner 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; gum elastic; -- also called
[1913 Webster +PJC]
4. Any substance, whether natural or synthetic, resembling
India rubber with respect to its elasticity.
5. A low-cut overshoe made of natural or synthetic rubber,
serving to keep the feet and shoes dry when walking in the
rain or on a wet surface; -- usually used in the plural.
6. A condom. [Slang]
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.