Pumice definitions

pŭm'ĭs
A light, porous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive.
noun
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An extremely porous, glassy, extrusive igneous rock typically light enough to float on water, used as an abrasive and in making soaps, polishes, etc.
noun
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To clean, polish, or smooth with pumice.
verb
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To clean, polish, etc. with pumice.
verb
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A usually light-colored, porous, lightweight rock of volcanic origin. The pores form when water vapor and gases escape from the lava during its quick solidification into rock.
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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.
noun
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To abrade or roughen with pumice.
verb
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Origin of pumice

Middle English from Anglo-Norman pomis from Late Latin pōmex from Latin pūmex alteration of spūma foam