Collins COBUILD Advanced Learner's English Dictionary - rubber bullet

(rubber bullets) A rubber bullet is a bullet made of a metal ball coated with rubber. It is intended to injure people rather than kill them, and is used by police or soldiers to control crowds during a riot. Rubber bullets were used to break up the demonstration. N-COUNT RUBBER PLANT (rubber plants) A rubber plant is a type of plant with shiny leaves. It grows naturally in Asia but is also grown as a house plant in other parts of the world. N-COUNT