Definitions from Wiktionary (crucible)

▸ noun:  (chemistry) A cup-shaped piece of laboratory equipment used to contain chemical compounds when heating them to very high temperatures.
▸ noun:  A heat-resistant container in which metals are melted, usually at temperatures above 500°C, commonly made of graphite with clay as a binder.
▸ noun:  The bottom and hottest part of a blast furnace; the hearth.
▸ noun:  (figuratively) A very difficult and trying experience, that acts as a refining or hardening process.
▸ Also see crucible

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