wafer

noun

1. a small adhesive disk of paste; used to seal letters

Definition categories: substance, paste

2. a small thin crisp cake or cookie

Definition categories: food, biscuit, cookie, cooky

3. thin disk of unleavened bread used in a religious service (especially in the celebration of the Eucharist)

Definition categories: food, bread, breadstuff

verb

1. (transitive) To seal or close with a wafer.