wa ‧ fer /ˈweɪfə $ -ər/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Old North French ; Origin: waufre ]
1 . a very thin ↑ biscuit
2 . a thin round piece of bread eaten with wine in the Christian ↑ communion ceremony
3 . a very thin flat piece of a hard substance
wafer of
wafers of silicon