World English Dictionary
wafer (ˈweɪfə)
1.  a thin crisp sweetened biscuit with different flavourings, served with ice cream, etc
2.  Christianity a thin disc of unleavened bread used in the Eucharist as celebrated by the Western Church
3.  pharmacol an envelope of rice paper enclosing a medicament
4.  electronics a large single crystal of semiconductor material, such as silicon, on which numerous integrated circuits are manufactured and then separated
5.  a small thin disc of adhesive material used to seal letters, documents, etc
6.  (tr) to seal, fasten, or attach with a wafer
[C14: from Old Northern French waufre, from Middle Low German wāfel; related to waffle1]

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