Bāc or Bāck, n.

n. [Fr. bac, a ferry-boat, Arm. bag, bak, a bark, D. bak, tray, bowl.]

1. (Brewing & Distilling.) A large tub or vessel into which the wort, &c., is drawn for the purpose of cooling, straining, mixing, &c. It has different names, according to its position and use; as, under-back : jack-back : spirit-back : wash-back. Ure.
2. A broad, flat boat, for carrying carriages, cattle, &c., over ferries, by means of a rope stretched across.