also: まるぼん
noun
reciter's book; complete set of books
Refers to a book containing the full text of a story, especially used by professional storytellers (e.g., rakugo performers). Also used for a complete set of books, such as an entire series or collection.
落語家は丸本を見ながら稽古をする。
Rakugo performers practice while looking at the reciter's book.
このシリーズの丸本を買うと、全巻揃う。
If you buy the complete set of this series, you'll have all the volumes.
Compound of 丸 (maru, 'whole, complete') and 本 (hon, 'book'). The reading まるほん is the standard, while まるぼん is a less common variant.