n. pl. thir·ty-two·mos
1. The page size (3.5 by 5.5 inches) that results when a printer's sheet is folded into 32 equal sections.
2. A book composed of pages of this size.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -mos
(Printing, Lithography & Bookbinding) a book size resulting from folding a sheet of paper into 32 leaves or 64 pages. Often written: 32mo or 32°
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014