D defs.my
Entry 3 senses Webster, 1913

Crucible

/(krṳ"sĭ*b'l)/ · Cru·ci·ble · IPA /ˈkɹuː.sɪ.bəl/
01 n. A vessel or melting pot, composed of some very refractory substance, as clay, graphite, platinum, and used for melting and calcining substa…
  1. 1.
    A vessel or melting pot, composed of some very refractory substance, as clay, graphite, platinum, and used for melting and calcining substances which require a strong degree of heat, as metals, ores, etc.
  2. 2.
    A hollow place at the bottom of a furnace, to receive the melted metal.
  3. 3.
    A test of the most decisive kind; a severe trial; as, the crucible of affliction.
Phrases & compounds
Hessian crucible — 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.