¹ Source: wiktionary.com
Medical Definition of Twenty-fourmo
1. Having twenty-four leaves to a sheet; as, a twenty-fourmo form, book, leaf, size, etc. A book composed of sheets, each of which is folded into twenty-four leaves; hence, indicating more or less definitely a size of book whose sheets are so folded; usually written 24mo, or 24 deg . Source: Websters Dictionary (01 Mar 1998)