quartos

quarto

[kwawr-toh]
noun, plural quartos.
1.
a book size of about 9½ × 12 inches (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 Neo-Latin in quartō in fourth (quartō, ablative singular of quartus fourth)

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World English Dictionary
quarto (ˈkwɔːtəʊ)
 
n , pl -tos
1.  4to, Often written: 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
2.  (formerly) a size of cut paper 10 in. by 8 in. (25.4 cm by 20.3 cm)
 
[C16: from New Latin phrase in quartō in quarter]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

quarto
late 15c., 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, © 2010 Douglas Harper
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