firestone

== English == === 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 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. ==== Translations ==== === Anagrams === forestine, fresnoite, set on fire