means A wafer is a very thin, crisp piece of something — a biscuit, a communion bread, a seal of paper, or a flat slice of semiconductor on which microchips are built.

from From Middle English 'wafre,' borrowed from Anglo-Norman 'wafre,' itself from a Germanic source — a cousin of the same root that gives us 'waffle,' both tracing back to a word meaning a honeycomb-patterned cake. The thread runs from sweet pressed cakes to the thin sealing discs of old letters, and finally — in the 20th century — to the gleaming silicon slices of the electronics age.