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eighteenmo

American  
[ey-teen-moh] / ˈeɪˈtin moʊ /

noun

plural

eighteenmos

  1. octodecimo.

eighteenmo British  
/ ˈeɪˈtiːnməʊ /

noun

  1. Also called: octodecimo.  Often written: 18mo.   18°.  a book size resulting from folding a sheet of paper into 18 leaves or 36 pages

  2. a book of this size

"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

Etymology

Origin of eighteenmo

eighteen + -mo

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.