Crucible
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): (n.) A hollow place at the bottom of a furnace, to receive the melted metal.
(2): (n.) 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.
(3): (n.) A test of the most decisive kind; a severe trial; as, the crucible of affliction.
King James Dictionary [2]
CRUCIBLE, n.
1. A chemical vessel or melting pot, made of earth, and so tempered and baked, as to endure extreme heat without melting. It is used for melting ores, metals, &c. 2. A hollow place at the bottom of a chemical furnace.
Holman Bible Dictionary [3]
Proverbs 17:3 Proverbs 27:21