grindstone
n. US //ˈɡɹaɪndˌstoʊn// UK //ɡɹˈaɪndstəʊn// grind·stone
From Middle English grind-ston, grindistan, (also as grindel-ston), equivalent to grind + stone. Cognate with Scots grindstane.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Last updated April 17, 2026