folio

1. N-COUNT A folio is a book made with paper of a large size, used especially in the early centuries of European printing. (尤指歐洲早期印刷的)對開本

Richard told me of three 16th-century folio volumes on alchemy. 理查德告訴過我16 世紀的關於鍊金術的三卷對開本書籍的事。