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

• Rhynchophora
• rhynchophorous
• Rhynchota
• rhyne
• Rhyniaceae
• rhyolite
• rhyolites
• rhyolitic
• rhyparographer
• rhyparographers
• rhyparographic
• rhyparographies
• rhyparography
• rhyta
• rhythm
• rhythmal
• rhythm and blues
• rhythmed
• rhythmi
• rhythmic
• rhythmical
• rhythmically
• rhythmic gymnastics
• rhythmicities
• rhythmicity