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n. pl. sex·to·dec·i·mos
1. The page size of a book composed of printer's sheets folded into 16 leaves or 32 pages.
2. A book composed of sextodecimo pages. In both senses also called sixteenmo.

[Latin sextōdecimō, ablative of sextusdecimus, one sixteenth : sextus, sixth; see s(w)eks in Indo-European roots + decimus, tenth (from decem, ten; see dekm̥ in Indo-European roots).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -mos
(Printing, Lithography & Bookbinding) bookbinding another word for sixteenmo
[C17: from Latin sextusdecimus sixteenth]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈsɪksˈtin moʊ)

n., pl. -mos.
1. Also called sextodecimo. a book size (about 4x6 in.; 10x15 cm) determined by printing on sheets folded to form 16 leaves or 32 pages.
2. a book of this size. Symbol: 16mo, 16°
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
However, such books, because they are routinely quired in eights, cannot have been produced simply by an additional folding of a full skin, for this would result in quires of sixteen leaves ("16mo" in the parlance of printed-book formats).
Kathleen Coburn identifed Coleridge's edition of Don Quixote as the Jarvis 1809 four-volume (16mo) edition (Coleridge, Notebooks 3: 4503).
The second reports on monuments at Antwerp, and would appear to have been transmitted, folded to 16mo format, inside an extant letter from Antwerp of 17 June 1611, when de Witt was on his way to Paris and ultimately Rome (where he died in 1622).