English

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Etymology

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18 + -mo, for an eighteenth of a sheet.

Noun

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18mo (usually uncountable, plural 18mos)

  1. (paper) Abbreviation of octodecimo, a page size
  2. (printing) A book size octodecimo-sized pages.

Synonyms

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See also

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English paper and book sizes
Latin folio quarto sexto octavo duodecimo sextodecimo octodecimo vicesimo-quarto trigesimo-secundo quadragesimo-octavo sexagesimo-quarto
ALA F Q   O D S T   Tt Fe Sf
height (cm) > 30 25-30 25-30 20-25 17.5-20 15-17.5 12.5-15 12.5-15 10-12.5 7.5-10 < 7.5
printers' folio quarto sixmo octavo twelvemo sixteenmo eighteenmo twenty-fourmo thirty-twomo forty-eightmo sixty-fourmo
abbrev. fo or f 4to 6to or 6mo 8vo 12mo 16mo 18mo 24mo 32mo 48mo 64mo
abbrev. 12º 16º 18º 24º 32º 48º 64º
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