Bookshelf/ˈbʊkʃelf/ Definition 1 of 1Pro Tip 1/3Furniture piece Identify bookshelf as an item of furniture designed specifically for books. They bought a bookshelf to organize their home library. Pro Tip 2/3Shelf arrangement Bookshelves come in tiers, with each row of shelves called a shelf or tier. Her bookshelf has five tiers, full of science fiction novels. Pro Tip 3/3Material variations Bookshelves can be made of different materials like wood, metal, or plastic. His wooden bookshelf matches the desk perfectly.