tinfoil

noun

1. tin, or an alloy of tin and lead, in the form of a thin sheet, much used as a wrapping for drugs, foods, tobacco, etc.

noun

1. thin foil made of tin or an alloy of tin and lead
2. thin foil made of aluminium; used for wrapping foodstuffs

n.late 15c., from tin (n.) + foil (n.).