English Dictionary

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quarto (ˈkwɔːtəʊ Pronunciation for quarto

Definitions

noun

(plural) -tos
  1. a book size resulting from folding a sheet of paper, usually crown or demy, into four leaves or eight pages, each one quarter the size of the sheet Often written: 4to,
  2. (formerly) a size of cut paper 10 in. by 8 in. (25.4 cm by 20.3 cm)

Word Origin

C16: from New Latin phrase in quartō in quarter

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