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pumice
WIKTIONARY
pumice
Noun
  • ∙ A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into the air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock.
Verb
  • ∙ To abrade or roughen with pumice. transitive