wafer

Some Nilla wafers.

Meanings

A light, thin, flat biscuit/cookie.
A thin disk of consecrated unleavened bread used in communion.
A soft disk originally made of flour, and later of gelatin or a similar substance, used to seal letters, attach papers etc.
A thin disk of silicon or other semiconductor on which an electronic circuit is produced.

From Middle English wafre, from Anglo-Norman wafre, waufre (Old French gaufre), from a Germanic source. Compare Middle Low German wāfel, Middle Dutch wafel ("honeycomb"), West Flemish wafer. See also waffle.

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