Nounwhetstone; grindstone

Nounsludge from sharpening a sword, etc. on a grindstone

Godan verb with 'gu' ending, Transitive verbto sharpen; to hone; to whet; to grind · to wash (rice) · to scour; to polish; to burnish

Nounscouring rushes; Equisetum hyemale; common horsetail

Nountonoko; powder made from dried clay used as a polishing powder, filler material, etc.