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

• gray polypody
• gray poplar
• gray sage
• gray sea eagle
• gray skate
• gray snapper
• gray sole
• gray substance
• gray whale
• gray willow
• gray wolf
• gray-black
• gray-blue
• gray-brown
• gray-green
• gray-haired
• gray-headed
• gray-leaf pine
• gray-pink
• gray-white
• grayback
• graybeard
• grayed
• grayhen
• grayish