The Japanese word for dictionary is
辞書

じしょ - jisyo
辞-word, term, expression (ji), 書-book; document (sho)

Japanese Definition

dictionary
1. 名詞. 辞典、辞書、字引。

辞書
1. n. a dictionary (publication that explains the meanings of an ordered list of words)
2. n. a letter of resignation
3. n. a formal document of abdication when one emperor steps down and a new emperor ascends the throne
4. n. (obsolete) a letter of resignation

字書
1. n. Kanji dictionary; Han character dictionary

辞典
1. n. a dictionary
2. n. Usage: * Japanese has a number of words that are translated in English as “dictionary”; see (Japanese dictionary) at Wikipedia.
3. n. Usage: * 辞典 is used (along with
4. n. Usage: *:
5. n. Usage: The reading