Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A fine-grained quartzite used to line refractory furnaces.
  • n. A mixture of fire clay and ground quartz, used to line metallurgical furnaces.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hard, fine-grained sandstone, used in manufacturing silica bricks for lining furnaces.

from the GNU version of the Collaborative International Dictionary of English

  • n. A refractory material consisting of crushed or ground siliceous stone, mixed with fire clay; -- used for lining Bessemer converters; also used for macadamizing roads.

from The Century Dictionary and Cyclopedia

  • n. In mining and metallurgy, a hard, silicious rock forming the floor of some coal-seams in England.

Etymologies

Origin unknown.
(American Heritage® Dictionary of the English Language, Fourth Edition)
The origin of this word is unknown. (Wiktionary)

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