Source : Webster's Revised Unabridged Dictionary (1913)

Matzoth \Matz"oth\, n. [Heb. matsts[=o]th, pl. of matsts[=a]h
   unleavened.]
   A cake of unleavened bread eaten by the Jews at the feast of
   the Passover.

Source : WordNet®

matzo
     n : brittle flat bread eaten at Passover [syn: {matzoh}, {matzah},
          {unleavened bread}]
     [also: {matzoth} (pl)]

matzoth
     See {matzo}