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octodecimo

[ok-tuh-des-uh-moh] /ˌɒk təˈdɛs əˌmoʊ/
noun, plural octodecimos for 2.
1.
a book size of about 4 × 6 1/4 inches (10 × 16 cm), determined by printing on sheets folded to form 18 leaves or 36 pages. Symbol: 18mo, 18°.
2.
a book of this size.
adjective
3.
in octodecimo.
Also called eighteenmo.
Origin
1855-1860
1855-60; short for New Latin in octōdecimō in an eighteenth (of a sheet)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for octodecimo

octodecimo

/ˌɒktəʊˈdɛsɪməʊ/
noun (pl) -mos
1.
(bookbinding) another word for eighteenmo
Word Origin
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
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