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octodecimo

[ ok-tuh-des-uh-moh ]

noun

, plural oc·to·dec·i·mos
  1. 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. : 18mo, 18°
  2. a book of this size.


adjective

  1. in octodecimo.

octodecimo

/ ˌɒktəʊˈdɛsɪməʊ /

noun

  1. bookbinding another word for eighteenmo
“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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Word History and Origins

Origin of octodecimo1

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

Origin of octodecimo1

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

Octodecimo, ok-tō-des′i-mō, adj. having eighteen leaves to the sheet, contracted 18mo.—adj.

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

The whole of this transaction was, if I may so speak, in the naughty vanity of my heart, a sort of octodecimo illustration of the "VENI, VIDI, VICI" of a certain illustrious character of antiquity.

"It is from your Father in heaven,—behold it!" said he, in a dramatic accent, and pulling out of his breast-pocket a small octodecimo Bible.

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