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.
Can you put the dictionary back in the box after you use it?
An electronic dictionary has various dictionaries in it.
I don’t know how to use a dictionary.