Boyd’s Bible Dictionary:
(brewed, baked). Early used (Gen. 18:5-6; Ex. 12:34; Jer. 7:18). Made of wheat, barley, rye, fitches, and spelt, in loaves or rolls, leavened or unleavened; the kneading being in troughs, bowls, or on flat plates, and the baking in portable ovens of earthenware, or upon heated stones, or on the coals.
Concise Bible Dictionary:
See PASSOVER.
Strong’s Dictionary of Greek Words:
Meaning:
from 1 (as a negative particle) and 2219; unleavened, i.e. (figuratively) uncorrupted; (in the neutral plural) specially (by implication) the Passover week
KJV Usage:
unleavened (bread)