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(Judaism) Food products made from leavened grain flour, which may not be consumed on Passover in Judaism. quotations examples
The eating of chametz (leavened products) is explicitly prohibited on Passover (Exod. 12:19–20; 13:3), for the Israelites “took their dough before it was leavened” (Exod. 12:34) and left Egypt in great haste.
2010, Ronald Eisenberg, What the Rabbis Said: 250 Topics from the Talmud, page 219
A chametz-free total environment is the Passover goal, so any place where chametz was or might have been used during the year is thoroughly checked and cleaned lest any chametz has been left behind.
2011, Irving Greenberg, The Jewish Way: Living the Holidays, page 43