Twenty-fourmo

Webster's Dictionary of the English Language

·adj Having twenty-four leaves to a sheet; as, a twenty-fourmo form, book, leaf, size, ·etc.

II. Twenty-fourmo ·noun 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°.

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