firestone
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fire·stone
(fīr′stōn′)n.
1. A flint or pyrite used to strike a fire.
2. A fire-resistant stone, such as certain sandstones.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
firestone
(ˈfaɪəˌstəʊn)n
(Geological Science) a sandstone that withstands intense heat, esp one used for lining kilns, furnaces, etc
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun 1. firestone - a piece of flint that is struck to light a fire
flint - a hard kind of stone; a form of silica more opaque than chalcedony
2. firestone - a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns
sandstone - a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
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