octodecimo

[ ok-tuh-des-uh-moh ]

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.

Origin of octodecimo

First recorded in 1855–60; short for New Latin in octōdecimō “in an eighteenth (of a sheet)”

Also called eighteenmo.

Words Nearby octodecimo

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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) /

nounplural -mos

bookbinding another word for eighteenmo

Origin of 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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