Definify.com
Webster 1913 Edition
Bac
Webster 1828 Edition
Bac
BAC
or BACK, n.1.
In navigation, a ferry-boat or praam.2.
In brewing, a large flat tub, or vessel, in which wort is cooled before boiling; hence called a cooler.3.
In distilleries, a vessel into which the liquor to be fermented is pumped, from the cooler, in order to be worked with the yeast.