Definitions
1.NounA light, thin, flat biscuit/cookie.
2.NounA thin disk of consecrated unleavened bread used in communion.
3.NounA soft disk originally made of flour, and later of gelatin or a similar substance, used to seal letters, attach papers etc.
4.NounA thin disk of silicon or other semiconductor on which an electronic circuit is produced.
5.VerbTo seal or fasten with a wafer.