burrstone

== English == === Alternative forms === buhrstone, burstone === Pronunciation === IPA(key): /ˈbɚstoʊn/ === Noun === burrstone (countable and uncountable, plural burrstones) A tough, silicified limestone formerly used to make millstones, typified by the presence of multiple cavities that originally housed fossilized shells. Synonyms: buhr, burr millstone === Anagrams === retrosnub, trueborns