A place where a vehement fire and heat may be made and maintained, for melting ores or metalsA furnace for casting cannon and other large operations is inclosed with walls through which a current of air is blown from a large bellows. In smaller operations a vessel is constructed with a chamber or cavity, with a door and a grate.

In scripture, a place of cruel bondage and affliction. Deuteronomy 4:20.

Grievous afflictions by which men are tried. Ezekiel 22:20-

A place of temporal torment. Danie! 3:6, 11, 15.

Hell; the place of endless torment. Matthew 13:42, 50.

To throw out sparks as a furnace.