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"flatbread" is also used as a crossword clue. If that's what you saw, the answer is often nan (3 letters).
Definitions
any of various breads made from usually unleavened dough
Word origin
From flat + bread.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Unleavened loaf”9 letters
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