n. & v.
--n.
1. a very thin light crisp sweet biscuit, esp. of a kind eaten with ice-cream.
2 a thin disc of unleavened bread used in the Eucharist.
3 a disc of red paper stuck on a legal document instead of a seal.
4 Electronics a very thin slice of a semiconductor crystal used as the substrate for solid-state circuitry.
5 hist. a small disc of dried paste formerly used for fastening letters, holding papers together, etc.
--v.tr. fasten or seal with a wafer.
Phrases and idioms:
wafer-thin very thin.
Derivatives:
wafery adj.
Etymology: ME f. AF wafre, ONF waufre, OF gaufre (cf. GOFFER) f. MLG wafel waffle: cf. WAFFLE(2)