soda bread

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A quick bread leavened with baking soda and buttermilk or sour milk.

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

• noun a bread made with buttermilk and leavened with baking soda.

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

• noun Bread made using sour milk and baking soda as a rising agent, rather than yeast; common in Ireland.