'Wash back' definitions:

Definition of 'Wash back'

From: GCIDE

Back \Back\, n. [F. bac: cf. Arm. bag, bak a bark, D. bak tray, bowl.]
1. A large shallow vat; a cistern, tub, or trough, used by brewers, distillers, dyers, picklers, gluemakers, and others, for mixing or cooling wort, holding water, hot glue, etc. [1913 Webster]
Hop back, Jack back, the cistern which receives the infusion of malt and hops from the copper.
Wash back, a vat in which distillers ferment the wort to form wash.
Water back, a cistern to hold a supply of water; esp. a small cistern at the back of a stove, or a group of pipes set in the fire box of a stove or furnace, through which water circulates and is heated. [1913 Webster]
2. A ferryboat. See Bac, 1. [1913 Webster]