noun
good book; valuable work
Refers to a book of high quality, often in terms of content, scholarship, or literary merit. Used in formal or evaluative contexts.
この図書館には良書がたくさん揃っている。
This library has a large collection of good books.
彼は若い頃に多くの良書を読んで教養を身につけた。
He read many valuable works in his youth and acquired a broad education.