Century Dictionary and Cyclopedia
- n twenty-fourmo A leaf from a sheet of paper regularly folded for a book in twenty-four equal parts. When the size of paper is not named, it is supposed to be a medium 24mo, of which the untrimmed leaf is about 3⅝ by 5⅛ inches.
- n twenty-fourmo A book made up of leaves folded in twenty-four equal parts.
- n twenty-fourmo Usually written 24 mo.