tinfoil, thin sheet of metallic tin used as a protective wrapping for food and tobacco because tin is nontoxic. Tinfoil is also used in electrical capacitors. Seefoil.
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The Editors of Encyclopaedia Britannica. "tinfoil". Encyclopedia Britannica, 11 Jul. 2023, https://www.britannica.com/technology/tinfoil. Accessed 23 April 2025.