Definitions

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

  • n. A flint or pyrite used to strike a fire.
  • n. A fire-resistant stone, such as certain sandstones.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Iron pyrites, formerly used for striking fire.
  • n. A flint.
  • n. 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.

from the GNU version of the Collaborative International Dictionary of English

  • n. Iron pyrites, formerly used for striking fire; also, a flint.
  • n. 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns
  • n. a piece of flint that is struck to light a fire

Etymologies

fire +‎ stone (Wiktionary)

Examples

  • Vulpix is a Fire-type Pokémon that evolves into Ninetales via firestone.

    Archive 2009-02-01

  • Scusteister var doubleclick_ad_params = 'wg=0;wa=51;wc=US;wi=anarchy;wi=theory;wi=biodiversity;wi=environmental;wi=issues;wi=farming;wi=stories;wi=feminism;wi=horses;wi=indie;jid=5568184;kw=postgenderism;kw=the;kw=singularity;kw=transalchemy;kw=shulamith;kw=firestone;kw=pregnancy;kw=transgenderism;c=jo;pt=jo;pc=l0';

    scusteister: The Fourth Wave: Transgenderism

  • In fact, I would argue that those numbers would be exactly the same even if Bill Clinton, for example, had not said a word and hadn't been this firestone of coverage.

    CNN Transcript Jan 25, 2008

  • And it was a Dwarven hearth, after all, with firestone instead of wood glowing red in the grate, and most of the extra heat carried away up the flue.

    Reiffeins Choice

  • A firestone fire glowed from a hearth near a pool the Dwarves had deepened with a low dam.

    Reiffeins Choice

  • Avender wanted to hear more about the pasties, but Nolo returned with fresh firestone and asked a question of Nurren before the boy could speak.

    Reiffeins Choice

  • The firestone burned red and black, driving the damp chill from the room.

    Reiffeins Choice

  • Seeing D'gan's eyes narrow angrily, he added hastily, "With eight men, I could have a mine producing a hundredweight of firestone every day within two sevendays."

    Dragon's Fire

  • "Yes, it seems like this firestone produces the fire gas more slowly,"

    Dragon's Fire

  • "If this were the old firestone, all the sea air would have combusted it long ago," Cristov remarked.

    Dragon's Fire

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