Definition of tinfoil noun from the Oxford Advanced American Dictionary

 

tinfoil

 noun
noun
NAmE//ˈtɪnfɔɪl//
 
[uncountable]
 
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metal made into very thin sheets, that is used for wrapping food, etc. Cover with tinfoil and bake for 20 minutes.
See the Oxford Advanced Learner's Dictionary entry: tinfoil