a thin cake made of flour and other ingredients.-a thin cake or piece of bread (commonly unleavened, circular, and stamped with a crucifix or with the sacred monogram) used in the eucharist, as in the roman catholic church.-an adhesive disk of dried paste, made of flour, gelatin, isinglass, or the like, and coloring matter, -- used in sealing letters and other documents.-to seal or close with a wafer.