noun
furnace
FER-nis/ˈfɜːrnɪs/
An enclosed chamber that produces intense heat.
The furnace glows orange around the steel billet inside.
Etymology
Latin fornax named an oven or kiln, a chamber where heat is concentrated. The English sense retains that basic image of an enclosed space producing intense heat.
In context
When the current is turned on and led through them into the furnace you can get the most amazing temperatures in the crucible.