from the GNU version of the Collaborative International Dictionary of English
- n. the cooling tub or vessel of a still worm.
Sorry, no etymologies found.
The steam would heat the mash in a large, straight-sided barrel of planking held together with hoops, and the vapor would travel into a second straight-sided barrel, a large thump keg. From there it went to the worm coil, which twisted through a square flake stand made of planking.