noun
ownership stamp; bookplate; ex libris
A stamp or seal placed in a book to indicate ownership, commonly used by collectors, libraries, or scholars.
古書店で買った本に、前の持ち主の蔵書印が押してあった。
The book I bought at the used bookstore had the previous owner's ownership stamp in it.
彼は自分の蔵書すべてに蔵
He stamps his ownership seal on all of his books.