octodecimo

[ok-tuh-des-uh-moh]

noun

plural

octodecimos 

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

Word History and Origins

Origin of octodecimo¹

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

Word History and Origins

Origin of octodecimo¹

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

Example Sentences

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

Read more on Project Gutenberg

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

Read more on Project Gutenberg

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.

Read more on Project Gutenberg

"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.

Read more on Project Gutenberg