How to pronounce wafer in English

"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."