Lexicon
Noun
じてん
その辞典、使い終わったらちゃんと箱の中にもどしておいてね。
Can you put the dictionary back in the box after you use it?
電子辞書には色んな辞典が入っています。
An electronic dictionary has various dictionaries in it.
辞典の使い方が分かりません。
I don’t know how to use a dictionary.
You need to know the word rules of the language you're learning, don't you? Then you need a good dictionary that can explain its lexicon!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.