- Also called pumice stone. a porous or spongy form of volcanic glass, used as an abrasive.
- to rub, smooth, clean, etc., with pumice.
Origin of pumice
Examples from the Web for pumiceous
All the upper part of the mountain is composed of a pumiceous tufa, rich in sanidine and of a characteristic greenish colour.A Study of Recent Earthquakes
Upon this rests a pumiceous breccia and conglomerate, with angular masses of trachyte, and some quartz pebbles.A Manual of Elementary Geology
It filled ravines, such as Fosso Grande, and concreted and hardened there into pumiceous tufa—a very instructive phenomenon.The San Francisco Calamity
- 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
- (tr) to rub or polish with pumice
Word Origin and History for pumiceous
1670s, from Latin pumiceus "of pumice stone," from pumex (see pumice).
c.1400, from Anglo-French and Old French pomis (13c.), from Late Latin pomicem (nominative pomex, genitive pumicis), from Oscan *poimex or some other dialectal variant of Latin pumex "pumice," from PIE *(s)poi-mo-, a root with connotations of "foam, froth" (see foam (n.)). Old English had pumic-stan. As a verb, early 15c., from the noun.
- A light, porous, glassy lava, used as an abrasive.
- 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.