from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. vincesimo-quarto (as a paper size in printing).

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having twenty-four leaves to a sheet.

from The Century Dictionary and Cyclopedia

  • n. A leaf from a sheet of paper regularly folded for a book in twenty-four equal parts.
  • n. A book made up of leaves folded in twenty-four equal parts.
  • n. Usually written 24 mo.


Sorry, no etymologies found.


  • Here is a table full of old parchment-bound books, ranging from a tiny twenty-fourmo, which will stay neither open nor shut, to thin, limp folios that are instantly correspondent to either command.

    The Booklover and His Books

  • As in the case of the Chinese book, it looks superficially like ours; we think it is a tiny quarto until we see that its measure is rather that of an oblong twenty-fourmo; that is, its dimensions are just scant of five inches high and six inches wide.

    The Booklover and His Books


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