From Longman Dictionary of Contemporary Englishrubberrub‧ber /ˈrʌbə $ -ər/ ●●○ S3 noun 1 [uncountable]TI a substance used to make tyres, boots etc, which is made from the juice of a tropical tree or artificially a rubber ball2 
[countable] British English a) DHHa small piece of rubber or similar material used for removing pencil marks from paper SYN eraser American English b) SESan object used for cleaning marks from a blackboard SYN eraser American English3 [countable] American English informalMB a condom4 → rubbers5 [countable]DGC a series of games of bridge or cricket6 [countable]DSG the piece of white rubber where the pitcher (=person who throws the ball) stands in a baseball game
[countable] British English a) DHHa small piece of rubber or similar material used for removing pencil marks from paper SYN eraser American English b) SESan object used for cleaning marks from a blackboard SYN eraser American English3 [countable] American English informalMB a condom4 → rubbers5 [countable]DGC a series of games of bridge or cricket6 [countable]DSG the piece of white rubber where the pitcher (=person who throws the ball) stands in a baseball gameExamples from the Corpus
rubber• Their bottoms are a rubber compound that provides better traction.• We just argued about it loudly and wore the T-shirts and big foam rubber fingers.• Sadler's used 1,900 square yards - made more impervious to the gas by an inner coat of rubber.• A mouthful of chocolate passed for breakfast before we forsook big boots for sticky rubber.• So he picked him up and took hint off the rubber runner and set him down on the sidewalk. 