Usually means: Book size, about six inches.
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We found 14 dictionaries that define the word eighteenmo:

General (14 matching dictionaries)
  1. eighteenmo: Merriam-Webster
  2. eighteenmo: Oxford Learner's Dictionaries
  3. eighteenmo: American Heritage Dictionary of the English Language
  4. eighteenmo: Collins English Dictionary
  5. eighteenmo: Wordnik
  6. eighteenmo: Wiktionary
  7. eighteenmo: Webster's New World College Dictionary, 4th Ed.
  8. eighteenmo: Infoplease Dictionary
  9. Eighteenmo, eighteenmo: Dictionary.com
  10. Eighteenmo: Online Plain Text English Dictionary
  11. eighteenmo: Webster's Revised Unabridged, 1913 Edition
  12. Eighteenmo: AllWords.com Multi-Lingual Dictionary
  13. eighteenmo: FreeDictionary.org
  14. eighteenmo: TheFreeDictionary.com

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Definitions from Wiktionary (eighteenmo)

▸ noun:  octodecimo (as a paper size in printing).

Similar:
sixteenmo, 18mo, 16mo, octodecimo, forty-eightmo, twelvemo, duodecimo, eightvo, twenty-fourmo, sextodecimo, more...

Opposite:
folio, quarto, octavo, duodecimo

▸ Words similar to eighteenmo

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Similar:
sixteenmo, 18mo, 16mo, octodecimo, forty-eightmo, twelvemo, duodecimo, eightvo, twenty-fourmo, sextodecimo, more...

Opposite:
folio, quarto, octavo, duodecimo



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