מַצָּה (matstsâhmats-tsaw'noun|feminineunleavened bread)
[Heb] מַצָּה ETCBC: מַצָּה‎ (subs|matzah) OSHL: m.de.ab GK: H5174 Greek: ἄρτος, κακός, μάχη
Derivation: from מָצַץ in the sense of greedily devouring for sweetness;
Strong's: properly, sweetness; concretely, sweet (i.e. not soured or bittered with yeast); specifically, an unfermented cake or loaf, or (elliptically) the festival of Passover (because no leaven was then used)
KJV: unleaved (bread, cake), without leaven.