bookshelf//ˈbʊkˌʃɛlf//A2Frequency Level 11NeutralNounbookshelfSingularbookshelvesPlural1A piece of furniture with horizontal shelves designed for storing and displaying books.I put my favorite books on the bookshelf.2A single horizontal shelf or ledge used for holding books.I placed my favorite novel on the top bookshelf.Synonymbookcasebook rack