1. A small thin crisp cake or cookie
   "He dunked the chocolate wafer in his milk"
    
2. Thin disk of unleavened bread used in a religious service (especially in the celebration of the Eucharist)
   "The priest distributed communion wafers to the congregation"
    
3. A thin slice of semiconductor material used as the substrate for manufacturing integrated circuits
   "The pure silicon wafer is processed to create multiple chips"
    
4. A small adhesive disk of paste; used to seal letters
   "She moistened the wafer and pressed it onto the envelope to seal it"

Derived forms: wafers

Type of: biccy [Brit, informal], bicky [Brit, informal], bikkie [Brit, informal], bikky [Brit, informal], biscuit [Brit], bread, breadstuff, cookie [N. Amer], cooky [N. Amer, informal], library paste, paste, staff of life

Encyclopedia: Wafer