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Duodecimo is a 9 letter word which starts with the letter D and ends with the letter O for which we found 2 definitions.

(a.) Having twelve leaves to a sheet; as a duodecimo from book leaf size etc.
(n.) 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 12ยก.
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