Slightly Acidic Loaf
This page is the CodyCross answer for the clue below from All Things Water, Group 1291, Puzzle 4 (Roman Aqueducts).
Question is: Slightly Acidic Loaf
and the answer is: SOURDOUGH
Word Meaning:
SOURDOUGH — A type of bread dough leavened with yeast and lactobacilli that produce acids giving a sour taste.
Definitions from Wiktionary.