12mo
nounEtymology 12 + -mo, for a twelfth of a sheet.
1
Abbreviation, Usually Abbreviation of duodecimo, a page size (5"-5.5" x 7.125"-7.5")
2
Media, Printing, Publishing Usually A book size using duodecimo-sized pages.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.