"Communion wafers" are small, thin, and round pieces of bread that are used in Christian religious services, representing the body of Jesus Christ in the ceremony of Holy Communion or the Eucharist. Full definition
Ignoring her talk of the devil, I unpacked the clump of old bread, the gleanings of the day's begging, and Liza sliced it into pieces thin as communion wafer. (bookbrowse.com)
Several of our member societies publish lists of suppliers of communion wafers suitable for people with coeliac disease on their websites. (aoecs.org)
Traditionally Panforte is baked in a round pan that has been lined with communion wafers (to make it easier to remove) which seems to indicate a religious connection. (joyofbaking.com)