hogframe

from The Century Dictionary.

• noun In steam-vessels, a fore-and-aft frame, usually above deck, forming in combination with the frame of the vessel a truss to resist vertical flexure: used chiefly in American river- and lake-steamers. A chain (called a hog-chain) is sometimes stretched over straining-posts for this purpose.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Steam Vessels) A trussed frame extending fore and aft, usually above deck, and intended to increase the longitudinal strength and stiffness. Used chiefly in American river and lake steamers. Called also hogging frame, and hogback.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun nautical A trussed frame extending fore and aft, usually above deck, and intended to increase the longitudinal strength and stiffness, used chiefly in American river and lake steamers.