cornstone From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounA kind of marly siliceous rock. Related wordsSynonymscorestonecarstonemoonstonepackstonecrowstonecamstonesoapstonerudstonebreakstonewoodstonepotstonestonecrabstonewhinstonepitchstoneragstone References Wiktionary — cornstone Wikipedia — cornstone