a thin, crisp cake or biscuit, often sweetened and flavored.
a thin disk of unleavened bread, used in the Eucharist, as in the Roman Catholic Church.
a thin disk of dried paste, gelatin, adhesive paper, or the like, used for sealing letters, attaching papers, etc.
Medicine/Medical. a thin sheet of dry paste or the like, used to enclose a powder to be swallowed.
any small, thin disk, as a washer or piece of insulation.
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)
to seal, close, or attach by means of a wafer or wafers: to wafer a letter.

1350–1400; Middle English wafre < Middle Dutch wafer, variant of wafel waffle1

waferlike, wafery, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1368, from Anglo-Fr. wafre, O.N.Fr. waufre "honeycomb, wafer," perhaps from Frankish (cf. Flem. wafer, altered from M.Du. wafel "honeycomb;" see waffle (n.)). Also found in O.Fr. as gaufre, gofre "wafer, waffle." Eucharistic bread first so called 1559.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Bourbon adds spark to these wafer-thin spice cookies.
The minority government's hold on power is wafer-thin, and some politicians have seen an opportunity for nationalist tub-thumping.
In many export industries, particularly steel, margins are already wafer-thin.
Scan-head miniaturization has shrunk the guts wafer-thin, so only the polycarbonate body is visible.
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