• synonyms


[doo-uh-des-uh-moh, dyoo-]
noun, plural du·o·dec·i·mos.
  1. 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°
  2. a book of this size.
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  1. in duodecimo; twelvemo.
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Origin of duodecimo

1650–60; short for Latin in duodecimō in twelfth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for duodecimo

Historical Examples of duodecimo

  • It was in the duodecimo form, and consisted of about three hundred pages.

    The Celtic Magazine, Vol. I No. V


  • Of Lintotts first duodecimo edition 2500 copies were quickly sold off.

    Prices of Books

    Henry B. Wheatley

  • The sizes of books had not yet all come to octavo or duodecimo.

    The Printed Book

    Henri Bouchot

  • Were it not for the riff-raff, that place would be a paradise in duodecimo.

    A Transient Guest

    Edgar Saltus

  • Her works have been published in eighty-four volumes, duodecimo.

    Lives of Celebrated Women

    Samuel Griswold Goodrich

British Dictionary definitions for duodecimo


noun plural -mos
  1. Also called: twelvemo a book size resulting from folding a sheet of paper into twelve leavesOften written: 12mo, 12°
  2. a book of this size
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Word Origin for duodecimo

C17: from Latin phrase in duodecimō in twelfth, from duodecim twelve
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for duodecimo

1650s, from Latin 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.

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Online Etymology Dictionary, © 2010 Douglas Harper