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Sextodecimo is a 11 letter word which starts with the letter S and ends with the letter O for which we found 2 definitions.

(a.) Having sixteen leaves to a sheet; of or equal to the size of one fold of a sheet of printing paper when folded so as to make sixteen leaves or thirty-two pages; as a sextodecimo volume.
(n.) A book composed of sheets each of which is folded into sixteen leaves; hence indicating more or less definitely a size of a book; -- usually written 16mo or 16ยก.
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