rubber

B2
UK /ˈrʌbə(r)/US /ˈrʌbər/

Meaning

adjective
made of rubber
a rubber ball
noun
a strong substance that can be stretched and does not allow liquids to pass through it, used for making tyres, boots, etc. It is made from the liquid (= sap) inside a tropical plant or is produced using chemicals.
a ball made of rubber

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a rubber ball

rubber·
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