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six·teen·mo | \ sik-ˈstēn-(ˌ)mō 
\
\ plural sixteenmos
Definition of sixteenmo
: the size of a piece of paper cut 16 from a sheet also : a book, a page, or paper of this size
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Time Traveler for sixteenmo
The first known use of sixteenmo was in 1847
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