noun
Western-style book; book of Western origin
Refers to a book produced in a Western binding style (as opposed to traditional Japanese binding), or a book originating from the West. Often used in library or antiquarian contexts.
この図書館には多くの洋本が所蔵されている。
This library holds many Western-style books.
彼は古書店で珍しい洋本を見つけた。
He found a rare Western book at the used bookstore.