Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of irestone is as below...

Firestone :: Firestone (n.) Iron pyrites, formerly used for striking fire; also, a flint..

Irestone :: Irestone (n.) Any very hard rock.

Firestone :: Firestone (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..

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