wafer

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wa·fer

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

wafer

(wā′fər)
n.
Pharmacology A flat, tablet of rice paper or dried flour paste encasing a powdered drug.
tr.v. wa·fered, wa·fering, wa·fers
Pharmacology To prepare in the form of wafers.

wafer

(wā′fĕr)
A thin envelope or disk used to enclose a medication or to separate two structures from one another.

wafer 

A very thin lens to be cemented on a larger lens to make a bifocal lens.