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folio

/ˈfəʊljəʊ/ /ˈfoʊliˌoʊ/
Visual illustration of folio: (books) A book made of sheets of paper each folded in half (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 cm in height.
noun

(books) A book made of sheets of paper each folded in half (two leaves or four pages to the sheet); hence, a book of the largest kind, exceeding 30 cm in height.