from The Century Dictionary and Cyclopedia
- n. In ship-building, a tank formed by partitions or bulkheads cutting off a part of the hold and specially constructed to hold water ballast. See ballast-tank. A midship deep-tank is in the middle of the length; the forepeak and afterpeak tanks, or trimming tanks, are at the ends of the vessel.
Sorry, no etymologies found.
Initially, semi-solid fermentation was used but this has largely been abandoned and replaced by deep-tank liquid fermentation.