a small adhesive disk of paste; used to seal letters
"She carefully placed a wafer on the envelope flap before sealing it shut."
a small thin crisp cake or cookie
"She reached for a wafer from the bowl to enjoy as a quick, sweet snack between meals."
thin disk of unleavened bread used in a religious service (especially in the celebration of the Eucharist)
"The priest carefully broke the wafer over the congregation's heads during the communion ceremony."
A light, thin, flat biscuit/cookie.
"She added a few wafer cookies to her tea for a quick afternoon snack."
To seal or fasten with a wafer.
"The old priest carefully placed the consecrated host on my forehead to seal me into communion."