[doo-uh-des-uh-moh, dyoo-]
noun, plural duodecimos.
Also called twelvemo. a book size of about 5 × 7½ inches (13 × 19 cm), determined by printing on sheets folded to form 12 leaves or 24 pages. Symbol: 12 mo, 12°
a book of this size.
in duodecimo; twelvemo.

1650–60; short for Latin in duodecimō in twelfth

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World English Dictionary
duodecimo (ˌdjuːəʊˈdɛsɪˌməʊ)
n , pl -mos
1.  Also called: twelvemo, 12mo, Often written: 12° a book size resulting from folding a sheet of paper into twelve leaves
2.  a book of this size
[C17: from Latin phrase in duodecimō in twelfth, from duodecim twelve]

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

1650s, from L. in duodecimo (folded) "in a twelfth" of a sheet, from ablative of duodecimus "twelfth," from duodecim (see dozen). Often abbreviated 12mo.; a book in which each page is the twelfth part of the printer's sheet.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Folio books are the largest, quarto the next largest, and octavo and duodecimo follow in descending order.
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