Why is a Flyleaf called Flyleaf?

A flyleaf is called so because it refers to the blank page or pages at the front or back of a book, which are often used for notes or inscriptions. The term "fly" likely derives from the Old English Word "fleogan," meaning to fly or flutter, suggesting the lightweight, loose nature of these pages. Essentially, these leaves can be seen as "flying" or flapping at the edges of the book.