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dark steamed bread made of cornmeal wheat and flour with molasses and soda and milk or water

a dark-brown steamed bread made of cornmeal and rye meal or graham or wheat flour sweetened with molasses.

[1855-60, Amer.]

Boston brown bread,

a very dark, steamed bread containing corn meal, flour (usually both wheat and rye), molasses, soda, and water or milk, commonly baked in cylindrical loaves.