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