Dictionary

pumice

noun pum·ice \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

pumice

noun pum·ice \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

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