Meanings
noun18mo (usually uncountable, plural 18mos)
plural 18mos
- abbreviationuncountableusuallypaperAbbreviation of octodecimo, a page size.
- uncountableusuallymediaA book size octodecimo-sized pages.
Synonyms: 18º, eighteenmo, octodecimo, T, 18º, eighteenmo, octodecimo
Synonyms & antonyms
nounA book size octodecimo-sized pages.
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Also see
Origin
18 + -mo, for an eighteenth of a sheet.
Full word history & related roots →Cite this entry
APA
18mo. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/18mo
MLA
“18mo.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/18mo. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “18mo,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/18mo.
Source: 18mo on Wiktionary, CC BY-SA 4.0.