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We found 8 dictionaries with English definitions that include the word closed books:
Click on the first link on a line below to go directly to a page where "closed books" is defined.

General (5 matching dictionaries)

1. closed books: Merriam-Webster.com [home, info]
2. closed books: Collins English Dictionary [home, info]
3. closed books: Vocabulary.com [home, info]
4. closed books: Wiktionary [home, info]
5. closed books: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

6. closed books: Legal dictionary [home, info]

Computing (1 matching dictionary)

7. closed books: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

8. closed books: Idioms [home, info]

(Note: See closed_book for more definitions.)

Quick definitions from WordNet (closed book) ▸ noun:  something that baffles understanding and cannot be explained ▸ Also see closed_book ▸ Words similar to closed books ▸ Usage examples for closed books ▸ Words that often appear near closed books ▸ Rhymes of closed books ▸ Invented words related to closed books