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-mo

  1. a suffix occurring in a series of compounds that describe book sizes according to the number of leaves formed by the folding of a single sheet of paper: sixteenmo.
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Origin of -mo

combining form extracted from duodecimo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -mo

-mo

suffix forming nouns
  1. (in bookbinding) indicating book size by specifying the number of leaves formed by folding one sheet of paper12mo, twelvemo, or duodecimo; 16mo or sixteenmo
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Word Origin

abstracted from duodecimo
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