Also called India rubber. natural rubber, gum. gum elastic. caoutchouc. a highly elastic solid substance, light cream or dark amber in color, polymerized by the drying and coagulation of the latex or milky juice of rubber trees and plants, especially Hevea and Ficus species.

a material made by chemically treating and toughening this substance, valued for its elasticity, nonconduction of electricity, shock absorption, and resistance to moisture, used in the manufacture of erasers, electrical insulation, elastic bands, crepe soles, toys, water hoses, tires, and many other products.

any of various similar substances and materials made synthetically.

an eraser of this material, for erasing pencil marks, ink marks, etc.

Informal. a rubber tire or a set of rubber tires.

a low overshoe of this material.

an instrument or tool used for rubbing, polishing, scraping, etc.