Koichi demanded an explanation about the wet character dictionary from Viet.
It suddenly started pouring rain and the kanji dictionary I was holding got soaking wet.
I bought this calligraphy dictionary at a secondhand bookstore over there.
The rules for letters can be found in a character dictionary. In Japanese, one "letter" or "character" can have a lot of information (we're talking kanji here). That means you need dictionaries for these individual letters as well! That's what this is.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.