definition of
rubber

[1] #1 rubber n. [natural rubber, India rubber, gum elastic, caoutchouc] 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. wn

[2] #2 rubber v. [rubberize, rubberise] coat or impregnate with rubber; "rubberize fabric for rain coats". wn

[3] #3 rubber s. [no-good] returned for lack of funds; "a rubber check"; "a no-good check". wn

[4] #4 rubber n. [synthetic rubber] any of various synthetic elastic materials whose properties resemble natural rubber. wn

[5] #5 rubber n. [rubber eraser, pencil eraser] an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil. wn