1. pumice - Noun
2. pumice - Verb
A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a fibrous structure. It is supposed to be produced by the disengagement of watery vapor without liquid or plastic lava. It is much used, esp. in the form of powder, for smoothing and polishing. Called also pumice stone.
Source: Webster's dictionaryIt's a vast, lonely, forbidding expanse of nothing rather like clouds and clouds of pumice stone. And it certainly does not appear to be a very inviting place to live or work. Frank Borman
To whom am I to present my pretty new book, freshly smoothed off with dry pumice stone? Catullus
Add 1-2 cm of pumice to the pot before adding the starter plug with seedling. Source: Internet
Handl's occupancy A German, Johann Handl, obtained a permit to mine pumice in October 1916. Source: Internet
Ash and pumice piled convert northeast of the volcano to a thickness of convert; convert away, the ash was convert deep. Source: Internet
As the light vessel approached the shore near Herculaneum, cinders and pumice began to fall on it. Source: Internet