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octodecimo

[ ok-tuh-des-uh-moh ]
/ ˌɒk təˈdɛs əˌmoʊ /
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noun, plural oc·to·dec·i·mos for 2.
a book size of about 4 × 6 1/4 inches (10 × 16 centimeters), determined by printing on sheets folded to form 18 leaves or 36 pages. Symbols: 18mo, 18°
a book of this size.
adjective
in octodecimo.
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Also called eighteenmo.

Origin of octodecimo

First recorded in 1855–60; short for New Latin in octōdecimō “in an eighteenth (of a sheet)”
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use octodecimo in a sentence

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

    The Story of Books|Gertrude Burford Rawlings

British Dictionary definitions for octodecimo

octodecimo
/ (ˌɒktəʊˈdɛsɪməʊ) /

noun plural -mos
bookbinding another word for eighteenmo

Word Origin for octodecimo

C18: from New Latin phrase in octodecimo in an eighteenth (of a whole sheet)
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
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