irestone

== English == === Etymology === From iron + stone. Compare ironstone. === Noun === irestone (plural irestones) (archaic, UK, mining) Any very hard rock. === References === “irestone”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC. === Anagrams === oneriest, serotine