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Definition of: pumice
Our photo definition of pumice 
(pum′is) noun
Spongy or cellular volcanic lava, used as an abrasive and polishing material, especially when powdered: also pumice stone.
—v.t. ·iced, ·ic·ing To smooth, polish, or clean with pumice. [<OF pomis, pumis <L pumex, pumicis]
—pu·mi·ceous (py·mish′əs) adjective
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