- [uncountable]
a size of page made by folding a standard sheet of paper twice to make eight pages 四开（标准印张的四分之一大小） - [countable]
a book with pages in quarto size 四开本图书 an early quarto edition of Shakespeare’s plays 莎士比亚戏剧的早期四开本
Word Originlate 16th cent.: from Latin (in) quarto ‘(in) the fourth (of a sheet)’, ablative of quartus ‘fourth’.