buhrstone, also burrstone /bûrˈstōn/

1. A variety of quartz, containing many small empty cells, which give it a roughness of surface particularly adapted for millstones
2. A millstone made of this

• soufflé
• soufflés
• sough
• soughed
• soughing
• soughing-tile
• soughing-tiles
• soughs
• sought
• sought after
• souk
• soukous
• soukouses
• souks
• soul
• soul brother
• soul brothers
• soul-confirming
• soul-curer
• soul-curers
• souldan
• soul-destroying
• souldier
• souled
• soul-fearing