What is the meaning of Ironstone?

(n.) A hard, earthy ore of iron.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). ironstone. Retrieved September 21, 2026, from http://smartdefine.org/ironstone/definitions/2023684
ChicagoWebster's. 2011. "ironstone" http://smartdefine.org/ironstone/definitions/2023684 (accessed September 21, 2026).
HarvardWebster's 2011, ironstone, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/ironstone/definitions/2023684>.
MLAWebster's. "ironstone" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/ironstone/definitions/2023684>