forebook
Etymology
From fore- + book.
forebook means A prelude to a book or series of books; a preface. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
noun
- A prelude to a book or series of books; a preface.“Could it be that for the writer everything happens in a forebook whose end he cannot see, whose end is in his book?”