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3 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Pum·ice stone Same as Pumice.
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From: Webster's Revised Unabridged Dictionary (1913)

 Pum·ice n.  Min. 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.
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From: WordNet (r) 2.0

 pumice stone
      n : a light glass formed on the surface of some lavas; used as
          an abrasive [syn: pumice]