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quarto

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quar⋅to

[kwawr-toh] noun, plural -tos, adjective
–noun
1. a book size of about 9 1/2 × 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.
–adjective
3. bound in quarto.

Origin:
1580–90; short for NL in quartō in fourth (quartō, abl. sing. of quartus fourth )
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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quar·to   (kwôr'tō)   
n.   pl. quar·tos
  1. The page size obtained by folding a whole sheet into four leaves.

  2. A book composed of pages of this size.


[Short for Middle English (in) quarto, (in) the fourth part (of a sheet), from Medieval Latin (in) quārtō, from Latin, ablative of quārtus, fourth; see kwetwer- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

quarto 
1475, from M.L. in quarto "in the fourth (part of a sheet of paper)," from quarto, abl. sing. of L. quartus "fourth" (see quart).
Online Etymology Dictionary, © 2001 Douglas Harper
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