from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A light, porous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive.
- transitive v. To clean, polish, or smooth with pumice.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into the air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock.
- v. To abrade or roughen with pumice.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. Lava having a loose, spongy or cellular structure; lava from which gas or steam has escaped in large quantities while it was becoming consolidated.
- To polish, rub, or otherwise treat with pumicestone; especially, in silver-plating, to clean with pumice and water, as the surface of an article to be plated.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. rub with pumice, in order to clean or to smoothen
- n. a light glass formed on the surface of some lavas; used as an abrasive
Middle English, from Anglo-Norman pomis, from Late Latin pōmex, from Latin pūmex, alteration of spūma, foam.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin pūmex ("pumice stone"). (Wiktionary)