-mo [mō]
[< ending of L abl. forms of ordinals, after prep. in, as in duodecimo (< duodecimus, twelfth)] suffix forming nouns
a book, pamphlet, etc. having (a specified number of) leaves as a result of the folding of a sheet of paper a given number of times [12mo, duodecimo, or twelvemo]

English World dictionary. . 2014.

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