noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Abbreviation of duodecimo, a page size (5"-5.5" x 7.125"-7.5") abbreviation, alt-of, uncountable, usually
2. 2
   A book size using duodecimo-sized pages. uncountable, usually

Synonyms

All synonyms

12ºduodecimotwelvemodd

Etymology

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

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