(rub′ər) noun
1. A tenacious, elastic material obtained by coagulating the milky latex of certain tropical plants, especially the tree Hevea brasiliensis. When purified, the crude rubber or caoutchouc is a white polymerized isoprene; it is insoluble in water or alcohol, and for commercial use is mixed with various vulcanizing agents, fillers, and pigments, then heated and molded into the desired form.
2. Anything used for rubbing, erasing, polishing, etc.
3. One who or that which rubs.
4. An article made of rubber, as an elastic band or an overshoe.
—adjective Made of rubber. [<RUB]
—rub′ber·y adjective

(rub′ər) noun
In bridge, whist, and other card games, a series of two or three games played by the same partners against the same adversaries, terminated when one side has won two games; also, the odd game which breaks a tie between the players.