Akademik

wafer
A thin sheet of dried flour paste, used to enclose a powder, the w. being moistened and folded over the drug, so that it can be swallowed without taste. [M.E., fr. O.Fr. waufre, fr. Germanic]

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wa·fer 'wā-fər n CACHET

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n.
a thin sheet made from moistened flour, formerly used to enclose a powdered medicine that is taken by mouth.

Medical dictionary. 2011.