grindstone
noun
- round sharpening stone used for grinding or sharpening ferrous tools
Wiktionary
Pronunciation: /ˈɡɹaɪn(d)ˌstəʊn/ / /ˈɡɹaɪn(d)ˌstoʊn/ / /ˈɡɹɪnˌstoʊn/
noun
Etymology: From Middle English grind-ston, grindistan, (also as grindel-ston), equivalent to grind + stone. Cognate with Scots grindstane.
- An abrasive wheel for sharpening, polishing, or grinding.
- Synonym of starry flounder.