a hard, readily cut and polished rubber, obtained by vulcanizing rubber with a large amount of sulfur, used in the manufacture of combs, buttons, and for electric insulation.
Also called ebonite.

1830–40; Vulcan + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vulcanite (ˈvʌlkəˌnaɪt)
Also called: ebonite a hard usually black rubber produced by vulcanizing natural rubber with large amounts of sulphur. It is resistant to chemical attack: used for chemical containers, electrical insulators, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The device consisted of a flexible sheet of vulcanite that could be adjusted into a convex shape by means of adjustable cords.
The tip of the vulcanite sheet was held between the teeth, and the handle and cords held in the hand.
The microphone, earpiece, and battery case are all made of molded vulcanite.
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