Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See duodecimo.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. duodecimo, or 12mo, a paper size, so called because it is cut 12 to a (huge, originally made) sheet
  • n. a page, book etc. of that size

from the GNU version of the Collaborative International Dictionary of English

  • See duodecimo.

from The Century Dictionary and Cyclopedia

  • Same as duodecimo: commonly written 12 mo.

Etymologies

twelve +‎ -mo (Wiktionary)

Examples

  • Quiz, illustrated by Phiz, and published in one volume, square twelvemo.

    Sketches by Boz

  • Dedicator is humbly of opinion that so many libels, upon your Honourable sex, were never contained in any previously published work, in twelvemo or any other mo.

    Sketches by Boz

  • An ordinary twelvemo book, without illustrations in the text, is usually printed in forms of thirty-two pages, on what is known as a single-cylinder flat-bed press, which prints only one side of the paper at an impression.

    The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing

  • In consequence of the many and varied sizes of papers now manufactured, the terms folio, quarto or 4to., octavo or 8vo., twelvemo or 12mo., and so on, as indicating the number of folds in the printed sheets, can no longer be relied upon as a definite guide to the sizes of books, hence the change, as follows: --

    The Private Library What We Do Know, What We Don't Know, What We Ought to Know About Our Books

  • The mention of any size, folio, quarto, octavo, twelvemo, sixteenmo, calls up at once a distinct mental picture of an ideal book for each dimension, and the series is marked by a decreasing thickness of paper and size of type as it progresses downward from the folio.

    The Booklover and His Books

  • Close, in the, year of God seventeen hundred and five, or six, I am not precisely certain which --- but I have a copy at home that stands next to my twelvemo copy of the Scots Acts, and ranges on the shelf with them very well.

    The Antiquary

  • THAT actuated by these considerations, and further moved by various slanders and insinuations respecting your Honourable sex contained in the said work, square twelvemo, entitled 'Sketches of Young

    Sketches of Young Gentlemen

  • Ladies, 'your Dedicator ventures to produce another work, square twelvemo, entitled' Sketches of Young Gentlemen, 'of which he now solicits your acceptance and approval.

    Sketches of Young Gentlemen

  • THAT your Dedicator has perused, with feelings of virtuous indignation, a work purporting to be 'Sketches of Young Ladies;' written by Quiz, illustrated by Phiz, and published in one volume, square twelvemo.

    Sketches of Young Gentlemen

  • Honourable sex, were never contained in any previously published work, in twelvemo or any other mo.

    Sketches of Young Gentlemen

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