Slang bread made of wheat flour with yeast as a leavening agent
See light bread in American Heritage Dictionary 4
noun Chiefly Southern & Southwestern U.S.
Leavened bread made with wheat flour. Also called regionally loaf bread.
Regional Note: Where the rest of the country simply says bread, Southerners often say light bread or, less commonly, loaf bread, to refer to bread made of wheat flour and leavened with yeast. Contrary to what Northerners might think, light bread is not a synonym for white bread. “Light” refers not to the color of the bread but to the yeast that “lightens” it, so light bread can be whole wheat or white. Light bread or loaf bread contrasts instead with pone or cornpone, bread made with corn meal and usually unleavened. See Note at pone.