Vigesimo-Quarto

Part of speech: noun (n.)

A book composed of sheets each of which is folded into twenty- four leaves; hence, indicating more or less definitely a size of book so made; -- usually written 24mo, or 24º.

Part of speech: adjective (a.)

Having twenty-four leaves to a sheet; as, a vigesimo-quarto form, book, leaf, size, etc.