pumice

  1. 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.
  2. Verb.  (transitive) To abrade or roughen with pumice.

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This entry was last updated on RefTopia from its source on 3/20/2012.