flysheet

/ˈflaɪˌʃiːt/
noun
  1. An outer protective sheet or cover for a tent, used to keep rain out and provide extra insulation.
    • Make sure the flysheet is properly secured before it starts raining.
    • The flysheet flapped loudly in the wind all night.
    • We put the flysheet over the tent to stay dry during the storm.
  2. A loose sheet of paper placed at the beginning or end of a book, often left blank or used for notes.
    • I found an old bookmark tucked into the flysheet of the library book.
    • The flysheet at the front of the novel had a map of the imaginary kingdom.
    • She wrote her name on the flysheet of the textbook.
Synonyms