1. A small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead
   - cupel, refractory pot

Derived forms: bone-ash cups

Type of: vessel

• sulphur bottom
• sulphur butterfly
• sulphur dioxide
• sulphur hexafluoride
• sulphur mine
• sulphur mustard
• sulphur oxide
• sulphur paintbrush
• sulphur-crested cockatoo
• sulphur-yellow
• sulphureous
• sulphurette
• sulphuretted
• sulphuric
• sulphuric acid
• sulphurised
• sulphurous
• sulphury
• sultan
• Sultan of Swat
• sultana
• sultanate
• Sultanate of Oman
• sultrily
• sultriness