sourdough bread

A bread with a slightly sour, tangy flavor created by using a special yeast starter as the leavener. Though most sourdoughs are made from all-purpose flour, there are many delicious variations including those made from whole-wheat or rye flour.

From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.