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

• swelldoms
• swelled
• swelled head
• swelled-headed
• swelled heads
• sweller
• swellers
• swellest
• swell-headed
• swelling
• swellingly
• swellings
• swellish
• swell-mob
• swell-mobs
• swell-mobsman
• swell-mobsmen
• swell organ
• swell organs
• swells
• swelt
• swelted
• swelter
• sweltered
• sweltering