bort or boart /bört/

1. Diamond fragments or dust
2. A coarse diamond or crystalline form of carbon, used industrially for cutting or as an abrasive

• sulfured
• sulfuring
• sulfurs
• sulk
• sulked
• sulkier
• sulkies
• sulkiest
• sulkily
• sulkiness
• sulkinesses
• sulking
• sulks
• sulky
• sullage
• sullages
• sullen
• sullener
• sullenest
• sullenly
• sullenness
• sullennesses
• sullied
• sullies
• sully