firestone

== English == === Alternative forms === fire stone, fire-stone === Etymology === From Middle English firestone, firstan, fyrestane, fyyr stone, from Old English fȳrstān, equivalent to fire +‎ stone. === Noun === firestone (countable and uncountable, plural firestones) Iron pyrite, formerly used for striking fire. A flint. A heat-resistant stone that will withstand intense heat of a furnace, used for lining kilns, campfire rings, fireplaces and furnaces; especially, the sandstone at the top of the upper greensand in the south of England. ==== Translations ==== === Anagrams === forestine, fresnoite, set on fire