A very thin, crispy cookie is called a wafer. Chocolate cream sandwiched with wafers is a delicious treat.

In addition to a cookie, wafer can also refer to the thin bread used during the Christian ritual of Holy Communion. These wafers are small and round. The word is used for other thin, disc-shaped objects as well, like an electronic wafer, a circular sliver of material that helps form a circuit. But the most common meaning is still the original "thin cake of paste," from a root that wafer shares with waffle.

Definitions of wafer

n a small thin crisp cake or cookie

Type of:
biscuit, cookie, cooky
any of various small flat sweet cakes (`biscuit' is the British term)

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

Type of:
bread, breadstuff, staff of life
food made from dough of flour or meal and usually raised with yeast or baking powder and then baked

n a small adhesive disk of paste; used to seal letters

Type of:
library paste, paste
an adhesive made from water and flour or starch; used on paper and paperboard

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