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Definition of pumice noun from the Oxford Advanced American Dictionary

 

pumice

 noun
noun
NAmE//ˈpʌməs//
 
(also pumice stone) [uncountable]
 
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a type of gray stone that comes from volcanoes and is very light in weight. It is used in powder form for cleaning and polishing, and in pieces for rubbing on the skin to make it softer.
See the Oxford Advanced Learner's Dictionary entry: pumice