Wafer

noun
1.
a thin, crisp cake or biscuit, often sweetened and flavored.
2.
a thin disk of unleavened bread, used in the Eucharist, as in the Roman Catholic Church.
3.
a thin disk of dried paste, gelatin, adhesive paper, or the like, used for sealing letters, attaching papers, etc.
4.
Medicine/Medical. a thin sheet of dry paste or the like, used to enclose a powder to be swallowed.
5.
any small, thin disk, as a washer or piece of insulation.
6.
Electronics. a thin slice of semiconductor used as a base material on which single transistors or integrated-circuit components are formed.
verb (used with object)
7.
to seal, close, or attach by means of a wafer or wafers:
to wafer a letter.
noun
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
verb
6.
(transitive) to seal, fasten, or attach with a wafer