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folio

noun [C]
 
 
/ˈfəʊ.li.əʊ/ US  /ˈfoʊ.li.oʊ/ (plural folios)

Definition

a book made of paper of a large size, especially one of the earliest books printed in EuropeKinds of books a single sheet of paper from a bookBooks and parts of books
(Definition of folio noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of folio