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Comprehensive
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calcium hydroxide a soft white crystalline compound made by the action of water on calcium oxide and used in the manufacture of cement, plaster, hard rubber products, and bleaching powder; slaked lime.
ebonite a very hard rubber, capable of being cut and polished, and used in combs, electrical insulators, and other items; vulcanite.
home plate in baseball, a five-sided flat slab of hard rubber at which the batter stands, and which the base runner must touch in order to score a run.
puck in ice hockey, the hard rubber disk that players try to hit into the net for goals.
vulcanite a hard rubber manufactured through the process of vulcanization.