Part of speech: noun

Volcanic lava; used as a polishing - material.

Part of speech: adjective

Pumiceous, pumiciform, pumicose.

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Usage examples "pumice":

  1. They reached the island on May 27th, and saw that the cone of Perborwatan was active, and that a column of vapor arose from it to a height of not less than ten thousand feet, while lumps of pumice were shot up to about six hundred feet. - "Complete Story of the San Francisco Horror", Richard Linthicum Trumbull White Samuel Fallows.
  2. His only preparation was to sharpen the edges of a diamond- shaped trowel used at the diggings, with a piece of pumice. - "The Planet Strappers", Raymond Zinke Gallun.
  3. If stained, rub with half of a potato or with a cork dipped in powdered pumice stone, wipe dry, wash, and polish with a little bath brick or sapolio. - "The Complete Home", Various.