tinfoil

/ˈtɪnˌfɔɪl/
noun
  1. A thin, shiny sheet of metal (usually aluminum, historically tin) used for wrapping food, cooking, or crafts.
    • The kids made crowns out of tinfoil for their pretend play.
    • I always use tinfoil to line the baking tray so cleanup is easier.
    • She covered the leftover casserole with tinfoil before putting it in the fridge.
  2. A material used in some crafts or as a protective covering, often associated with conspiracy theories (e.g., tinfoil hat).
    • Some people believe that wrapping your phone in tinfoil blocks signals.
    • He wore a tinfoil hat as a joke during the costume party.
    • The artist created a sculpture entirely from recycled tinfoil.
What does "tinfoil" mean? | whatsthatwordmean | whatsthatwordmean