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twelvemo

[twelv-moh]
noun, plural twelve·mos, adjective
  1. duodecimo.
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Origin of twelvemo

First recorded in 1810–20; twelve + -mo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for twelvemo

twelvemo

noun plural -mos
  1. bookbinding another word for duodecimo
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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