pumice

Noun
  1. A light glass formed on the surface of some lavas;
    Used as an abrasive (synset 114724599)
    is a type of: rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust
    same as: pumice stone
Verb
  1. Rub with pumice, in order to clean or to smoothen (synset 201252807)
    is a type of: rub - move over something with pressure

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