Firestone meaning

fīrstōn
A flint or pyrite used to strike a fire.
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A fire-resistant stone, such as certain sandstones.
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(historical) Flint or iron pyrites used for striking fire.
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A stone that can withstand intense heat.
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Iron pyrites, formerly used for striking fire.
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A stone which will bear the heat of a furnace without injury; especially applied to the sandstone at the top of the upper greensand in the south of England, used for lining kilns and furnaces.
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A surname​.
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Origin of firestone