Twelvemo

noun

noun ·Uncommon ·Advanced level

Definitions

Noun

1
duodecimo, or 12mo, a paper size, so called because it is cut 12 to a (huge, originally made) sheet
2
a page, book etc. of that size

Synonyms

12mo 12º duodecimo 12mo baby bantam

Etymology

From twelve + -mo.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.