wafer

n. thin crispy cookie or cracker (often eaten as a desert with ice cream); bite-size piece of unleavened bread taken during the Eucharist (Christianity); chip (Electronics); flat round bit of adhesive (as is used to seal an envelope)

v. close or seal with a wafer (an envelope); divide into wafers (Electronics); pack powdered medicine in dried flour paste or rice paper (Pharmacology)

In cooking, a wafer is a crisp, sweet, very thin, flat, and dry cake that is often used to decorate ice cream. Wafers can also be made into cookies with cream flavoring sandwiched between them. They frequently have a waffle surface pattern.The word also refers to the special small round flat breads made for Anglican Holy Communion services; the word host is used in the Roman Catholic liturgy. These holy wafers often have an image of the crucified Christ imprinted on them.In the spa towns of the Slovak Republic (e.g. Piešťany, etc.) special "spa wafers" (kúpeľné oplátky) are produced.
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n. wafer

(v. t.)
To seal or close with a wafer.
  

(n.)
An adhesive disk of dried paste, made of flour, gelatin, isinglass, or the like, and coloring matter, -- used in sealing letters and other documents.
  

(n.)
A thin cake or piece of bread (commonly unleavened, circular, and stamped with a crucifix or with the sacred monogram) used in the Eucharist, as in the Roman Catholic Church.
  

(n.)
A thin cake made of flour and other ingredients.
  

A thin slice of semiconducting material, such as a silicon crystal, upon which microcircuits are constructed by diffusion and deposition of various materials. Note: Millions of individual circuit elements, constituting hundreds of microcircuits, may be constructed on a single wafer. The individual microcircuits are separated by scoring and breaking the wafer into individual chips ("dice").