1. A decorative item: This is a glass bottle that has been shaped and painted to resemble a book. It often includes details like a spine, cover, and pages, and can be used as a vase, a decorative piece, or a unique gift.
2. A method of preserving books: This refers to a technique where a book is placed inside a glass bottle. The book is usually flattened and the pages treated to prevent deterioration. It's a unique way to preserve and display old or damaged books.
To understand which meaning is intended, you need more context. For example, if you're reading about crafting or home decor, it likely refers to the decorative item. If you're reading about book preservation, it likely refers to the preservation method.
Could you please provide more context about where you encountered the term "book bottle"? This will help me give you a more accurate answer.