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Meaning of quarto

quar•to

Pronunciation: (kwôr'tō), [key]
— n., pl. adj. -tos,
—n.
  1. a book size of about 9 × 12 in. (24 × 30 cm), determined by folding printed sheets twice to form four leaves or eight pages. Symbol: 4to, 4°
  2. a book of this size.
—adj.
  1. bound in quarto.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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