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.

firestone

(ˈfaɪəˌstəʊn)
n
(Geological Science) a sandstone that withstands intense heat, esp one used for lining kilns, furnaces, etc
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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.)