twelvemo

noun
twelve·​mo | \ˈtwelv-(ˌ)mō \
plural twelvemos

Definition of twelvemo 

: the size of a piece of paper cut 12 from a sheet also : a book, a page, or paper of this size

First Known Use of twelvemo

1816, in the meaning defined above

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The first known use of twelvemo was in 1816

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