Definition of quarto noun from the Oxford Advanced American Dictionary

     

    quarto

     noun
    noun
    NAmE//ˈkwɔrt̮oʊ//
     
    (pl. quartos)(technology)
     
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  1. 1[uncountable] a size of page made by folding a standard sheet of paper twice to make eight pages
  2. 2[countable] a book with pages in quarto size an early quarto edition of Shakespeare's plays
See the Oxford Advanced Learner's Dictionary entry: quarto