The lower deck.
1835. [You] quit the cabin for the seats on the boiler-deck, or still better, for the hurricane-deck above.C. J. Latrobe, The Rambler in North America, i. 223 (N.Y.).
1838. He had followed his friend, the Kentuckian, to the boiler-deck, where, as usual, remarkable cases of boiler-burstings, burnings, snaggings, &c. were told.R. M. Bird, Peter Pilgrim, i. 86 (Phila.).
1875. See TEXAS-DECK.