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

• fluidnesses
• fluid ounce
• fluids
• fluier
• fluiest
• fluke
• fluked
• flukes
• fluke-worm
• flukey
• flukier
• flukiest
• flukily
• flukiness
• flukinesses
• fluking
• fluky
• flume
• flumes
• flummeries
• flummery
• flummox
• flummoxed
• flummoxes
• flummoxing