Dictionary

octavo

noun oc·ta·vo \äk-ˈtā-(ˌ)vō, -ˈtä-\
plural oc·ta·vos

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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Origin of OCTAVO

Latin, abl. of octavus eighth
First Known Use: 1582

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