Translation guide
A monolingual dictionary where English words are defined in English. This guide helps learners express this concept naturally in Japanese.
英英辞典
English-English dictionary
Referring to a dictionary that explains English words using English definitions.
The most common and natural way to say 'English-English dictionary' in Japanese. 英英 means 'English-English' and 辞典 means 'dictionary'.
英英辞典を使うと、英語の語彙力が上がります。
Using an English-English dictionary improves your English vocabulary.
A slightly less formal variant using 辞書 instead of 辞典. Both are common, but 辞典 is more standard for this compound.
この英英辞書は初心者向けです。
This English-English dictionary is for beginners.
Explicitly says 'English-language English-English dictionary'. Redundant but can be used for clarity.
英語の英英辞典を買いました。
I bought an English-language English-English dictionary.
英和辞典 (えいわじてん) is an English-Japanese dictionary. 英英辞典 is an English-English dictionary. Don't confuse them.
最初は英和辞典を使い、慣れたら英英辞典に切り替えましょう。
Start with an English-Japanese dictionary, then switch to an English-English dictionary once you're used to it.