Crucible
/krˈusəbəl/
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Definition
(noun) A cup-shaped piece of laboratory equipment used to contain chemical compounds when heating them to very high temperatures.
Sentence Examples
Due to improper procedures, the foundry had an excess of slag in the crucible.
Only one competitor can emerge from the crucible of losers' bracket.
CEFR Practice Quiz
Due to improper procedures, the foundry had an excess of slag in the ____.