#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 rubber v. [rubberize, rubberise] coat or impregnate with rubber; "rubberize fabric for rain coats". wn
#3 rubber s. [no-good] returned for lack of funds; "a rubber check"; "a no-good check". wn
#4 rubber n. [synthetic rubber] any of various synthetic elastic materials whose properties resemble natural rubber. wn
#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
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