pumice


pum·ice

noun \ˈpə-məs\

: a gray stone that comes from volcanoes, is full of small holes, has a very light weight, and is used especially for smoothing and polishing things or for softening the skin

Full Definition of PUMICE

:  a volcanic glass full of cavities and very low in density that is used especially in powder form for smoothing and polishing
pu·mi·ceous \pyü-ˈmi-shəs, ˌpə-\ adjective

Origin of PUMICE

Middle English pomis, from Anglo-French pomice, from Latin pumic-, pumex — more at foam
First Known Use: 15th century

pum·ice

noun \ˈpəm-əs\   (Medical Dictionary)

Medical Definition of PUMICE

: a volcanic glass full of cavities and very light in weight used especially in powder form for smoothing and polishing

pumice

noun    (Concise Encyclopedia)

Very porous, frothlike volcanic glass that has long been used as an abrasive in cleaning, polishing, and scouring compounds. It is also used in precast masonry units, poured concrete, insulation and acoustic tile, and plaster. Pumice is igneous rock that cooled so rapidly there was no time for it to crystallize. When it solidified, the vapours dissolved in it were suddenly released, and the whole mass swelled up into a froth that immediately consolidated. Any type of lava may become pumiceous under favourable conditions.

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