a suffix occurring in a series of compounds that describe book sizes according to the number of leaves formed by the folding of a single sheet of paper: sixteenmo.

combining form extracted from duodecimo

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World English Dictionary
suffix forming nouns
(in bookbinding) indicating book size by specifying the number of leaves formed by folding one sheet of paper: 12mo, twelvemo, or duodecimo; 16mo or sixteenmo
[abstracted from duodecimo]

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