Definitions

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

  • n. The page size (3 1/2 by 5 1/2 inches) that results when a printer's sheet is folded into 32 equal sections.
  • n. A book composed of pages of this size.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A paper size, (3.75"-5" x 2.5"-3.125"), one thirty-secondth of an uncut free sheet.
  • n. A book size, corresponding to the paper size.

Etymologies

thirty-two +‎ -mo (Wiktionary)

Examples

  • Cf the printing terms 32mo (thirty-twomo) & 64mo (sixty-fourmo).

    On twoth

  • I sought the companionship of several low-browed, ill-favored fellows whom I believed suited to my purposes, but almost immediately I wearied of them, for they had never looked into a book and were so profoundly ignorant as to be unable to distinguish between a folio and a thirty-twomo.

    The Love Affairs of a Bibliomaniac

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