• synonyms


noun, plural eight·een·mos, adjective
  1. octodecimo.
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Origin of eighteenmo

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for eighteenmo

Historical Examples of eighteenmo

  • Other sizes occasionally used are called “sixteenmo” or “sextodecimo,” “eighteenmo” or “octodecimo,” etc.

    The Story of Books

    Gertrude Burford Rawlings

British Dictionary definitions for eighteenmo


noun plural -mos
  1. Also called: octodecimo a book size resulting from folding a sheet of paper into 18 leaves or 36 pagesOften written: 18mo, 18°
  2. a book of this size
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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