Definify.com
Webster 1913 Edition
Twenty-fourmo
Twenˊty-four′mo
,Adj.
Having twenty-four leaves to a sheet;
– as, a
. twenty-fourmo
form, book, leaf, size, etcNoun.
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°.