12mo

noun

A book size using duodecimo-sized pages.

Similar
D12ºtwelvemoduodecimo
Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

noun12mo (usually uncountable, plural 12mos)

plural 12mos

  1. abbreviationuncountableusuallypaperAbbreviation of duodecimo, a page size (5"-5.5" x 7.125"-7.5")
  2. uncountableusuallymediaA book size using duodecimo-sized pages.

    Synonyms: D, 12º, twelvemo, duodecimo

Synonyms & antonyms

nounA book size using duodecimo-sized pages.

Similar
D12ºtwelvemoduodecimo
Also see
duodecimotwelvemo

Origin

12 + -mo, for a twelfth of a sheet.

Full word history & related roots →
Cite this entry
APA

12mo. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/12mo

MLA

“12mo.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/12mo. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “12mo,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/12mo.

Source: 12mo on Wiktionary, CC BY-SA 4.0.