rubber

(noun) an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products. Synonyms: natural rubber, India rubber, gum elastic, caoutchouc.

(noun) any of various synthetic elastic materials whose properties resemble natural rubber. Synonyms: synthetic rubber.

(noun) an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil. Synonyms: rubber eraser, pencil eraser.

(noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse. Synonyms: condom, safety, safe, prophylactic.

(noun) a waterproof overshoe that protects shoes from water or snow. Synonyms: arctic, galosh, golosh, gumshoe.

(verb) coat or impregnate with rubber. Synonyms: rubberize, rubberise. Examples: "Rubberize fabric for rain coats."

(adj) returned for lack of funds. Synonyms: no-good. Examples: "A rubber check." "A no-good check."