a furnace: a large fire chamber of the kind used to fire brick and smelt metal, big enough to hold a person thrown inside
Every use of this Aramaic word sits inside one chapter, the story of the three men and the fire in Daniel 3, and it names one object: the furnace on the plain outside Babylon. There is nothing poetic about the word itself. Babylon was a city built of fired brick, so a kiln of this size was ordinary working equipment, as common as a quarry or a forge. What the story does is take that familiar piece of industry and hand it to the state as a way of killing people who will not bow.
The chapter puts the furnace to work in stages, and the same plain word carries all of them:
- it is the threat written into the king's decree, named the moment the music starts (Daniel 3:6, Daniel 3:11, Daniel 3:15)
- it is the thing three men say they will not fear, because the God they serve is able to bring them out of it (Daniel 3:17)
- it is stoked seven times hotter than usual, until its own flame kills the soldiers who carry the prisoners up to it (Daniel 3:19, Daniel 3:22)
- it is where the king finally walks over and calls the men out at its door (Daniel 3:26)
The details of the story fit a kiln rather than a stove. The men are bound and dropped in from above, falling into the middle of it, while the king can walk up to an opening at ground level, look in, and speak to people inside. Hebrew keeps separate words for the other working fires: the smelting furnace where metal is refined (כּוּר), and the brick and lime kiln whose smoke goes up like a column (כִּבְשָׁן). Daniel's Aramaic word belongs with that second kind, an industrial fire large enough to swallow whatever is put in it.
The picture outlasted the chapter. When Greek translators of Daniel needed a word for it they used the ordinary Greek word for a furnace (κάμινος), and that is the word Matthew's Gospel reaches for when it speaks of a furnace of fire at the end of the age (Matthew 13:42, Matthew 13:50).