octavo

noun

oc·​ta·​vo äk-ˈtā-(ˌ)vō  -ˈtä- 

plural octavos

: the size of a piece of paper cut eight from a sheet

also : a book, a page, or paper of this size

Word History

Etymology

Latin, ablative of octavus eighth

First Known Use

1582, in the meaning defined above

Kids Definition

octavo

noun

oc·​ta·​vo äk-ˈtā-vō  -ˈtäv-ō 

plural octavos

: a book made up of sheets of paper that have been folded to produce eight leaves