wafer

noun

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

   Less specific

   • paste, library paste

2. a small thin crisp cake or cookie

   Less specific

   • cookie, cooky, biscuit

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

   Less specific

   • bread, breadstuff, staff of life