tinfoil

[tin-foil]
noun
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.
Also called, British, silver paper.


Origin:
1425–75; late Middle English tynfoile. See tin, foil2

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World English Dictionary
tinfoil (ˈtɪnˌfɔɪl)
 
n
1.  thin foil made of tin or an alloy of tin and lead
2.  thin foil made of aluminium; used for wrapping foodstuffs

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
So, you can keep that tinfoil helmet in your closet for now.
Only your tinfoil cap protects you from their deviant rays.
Also in the briefcase were seven four-packs of lithium batteries and rolled
  tinfoil.
He found a piece of tinfoil and carefully wrapped the ductwork, blocking the
  crack.
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