pumice
n. மெருகு மாக்கல்வகை, படிகக் கல், சிட்டக்கல், (வினை.) மாக்கல்கொண்டு தேய், சிட்டக்கல்லால் துப்புரவு செய்.
Pum"ice, n. Etym: [L. pumex, pumicis, prob. akin to spuma foam: cf. AS. pumic-stan. Cf. Pounce a powder, Spume.] (Min.) Defn: 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.