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Noun: hard rubber  haa(r)d rú-bu(r)
  1. A hard nonresilient rubber formed by vulcanizing natural rubber
    "Hard rubber was once commonly used to make fountain pens and pipe stems";
    - vulcanite, ebonite

Derived forms: hard rubbers

Type of: caoutchouc, gum elastic, India rubber, natural rubber, rubber

Encyclopedia: Hard rubber