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

• depth psychology
• depths
• dorsels
• dorser
• dorsers
• dorses
• dorsibranchiate
• dorsiferous
• dorsifixed
• dorsiflex
• dorsiflexion
• dorsiflexions
• dorsigrade
• dorsiventral
• dorsiventralities
• dorsiventrality
• dorsolateral
• dorsolumbar
• dorsoventral
• dorsum
• dort
• dorted
• dorter
• dorters
• dortier