Also called pumice stone. a porous or spongy form of volcanic glass, used as an abrasive.
verb (used with object), pumiced, pumicing.
to rub, smooth, clean, etc., with pumice.

before 1000; < Latin pūmic-, stem of pūmex pumice stone; replacing Middle English pomis(e), pomish(e), pomice < Middle French pomis < Latin; compare Old English pumic- (< L), in pumicstān pumice stone; see pounce3

pumiceous [pyoo-mish-uhs] , adjective
pumicer, noun
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World English Dictionary
pumice (ˈpʌmɪs)
1.  Also called: pumice stone a light porous acid volcanic rock having the composition of rhyolite, used for scouring and, in powdered form, as an abrasive and for polishing
2.  (tr) to rub or polish with pumice
[C15 pomys, from Old French pomis, from Latin pūmex]

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Word Origin & History

c.1400, from O.Fr. pomis (c.1250), from L.L. pomex (acc. pomicem, gen. pumicis), from Oscan *poimex, a variant of L. pumex "pumice," from PIE *poimo-, with connotations of "foam, froth." O.E. had pumic-stan.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pumice pum·ice (pŭm'ĭs)
A light, porous, glassy lava, used as an abrasive.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pumice   (pŭm'ĭs)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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