crucible : Idioms & Phrases
crucible steel
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noun steel made by the mixture of molten wrought iron, charcoal, and other substances in a crucible
WordNet
Hessian crucible
(Chem.) , a cheap, brittle, and fragile, but very refractory crucible, composed of the finest fire clay and sand, and commonly used for a single heating; named from the place of manufacture.
