grindstone n : a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools
Grindstone may refer to:
- Grindstone (tool), the grinding tool used for sharpening
- Grindstone (millstone), used to grind grains such as wheat
- Grindstone (horse), 1996 Kentucky Derby winner and sire of the racehorse Birdstone
- Grindstone (album), 2007 album by the Norwegian band Shining
- Grindstone (band), a band who contributed to the sound track of the Nintendo 64 car racing game, Top Gear Overdrive.