Having twelve leaves to a sheet; as, a duodecimo from, book, leaf, size, etc.
A book consisting of sheets each of which is folded into twelve leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 12mo or 12°.
A book format formed by a single sheet folded into twelve sections. editio princeps The first printed edition of a work previously available only in manuscript.
The page size of a book (5" wide x 7 3/4" high), formed by folding a single printer's sheet into 12 leaves. Compare other Book Sizes
Description of the size of a book: about 7.75 inches high (12mo).
a book that is approximately 7 to 8 inches tall.
often pronounced twelvemo and written as 12mo. A small format book made from sheets folded to give twelve leaves: also used in a more general way of books under about 7 inches (18cm) tall.
In printed books, a standard piece of paper (a foolscap, 17" by 13.5," but sizes varied), folded in twelfths. The term also describes a volume made up of duodecimo sheets. Thus, a duodecimo volume has twelve leaves (twenty-four pages front-and-back) per gathering. Sometimes, the term applies to books of a certain size regardless of the number of pages per gathering.
(12mo) - A book approximately seven to eight inches tall.