Definition of wafer

Definition of wafer
  1. wafer Noun A light, thin, flat biscuit.
  2. wafer Noun A thin disk of consecrated unleavened bread used in communion.
  3. wafer Noun A soft disk originally made of flour, and later of gelatin or a similar substance, used to seal letters.
  4. wafer Noun A thin disk of silicon or other semiconductor on which an electronic circuit is produced.
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