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hard mouth
hard news
hard-nosed
hard-of-hearing
hard-on
hard palate
hard-pressed
hard rock
hard rubber
hard sauce
hard science
hard sell
hard-set
hard-shell
hard-shell clam
hard-shell crab
hard-shelled
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hard rubber

hard rub·ber


noun 
Definition:
 
vulcanized rubber: rubber treated with sulfur to make it hard and stiff

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