pumice
pum·ice
noun \ˈpə-məs\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
See Origin of PUMICE
Middle English pomis, from Anglo-French pomice, from Latin pumic-, pumex — more at foam
First Known Use: 15th century
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