oc·ta·vo | \ äk-ˈtā-(ˌ)vō 
, -ˈtä- \
, -ˈtä- \ plural octavos
Definition of octavo
: the size of a piece of paper cut eight from a sheet also : a book, a page, or paper of this size
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Time Traveler for octavo
The first known use of octavo was in 1582
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