Shah \Shah\ (sh[aum]), n. [Per. sh[=a]h a king, sovereign, prince. Cf. {Checkmate}, {Chess}, {Pasha}.] The title of the supreme ruler in certain Eastern countries, especially Persia. [Written also {schah}.] {Shah Nameh}. [Per., Book of Kings.] A celebrated historical poem written by Firdousi, being the most ancient in the modern Persian language. --Brande & C.