from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See octodecimo.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. octodecimo (as a paper size in printing).
from the GNU version of the Collaborative International Dictionary of English
- See octodecimo.
from The Century Dictionary and Cyclopedia
- n. A size of book of which each signature is made up of 18 folded leaves, making 36 pages to the signature: commonly written 18mo.
- Of the size of a sheet folded into eighteen leaves; consisting of such sheets: as, an eighteenmo page or book.
From 18mo, abbr. of octodecimo.(American Heritage® Dictionary of the English Language, Fourth Edition)