Definition of octavo noun from the Oxford Advanced American Dictionary

 

octavo

 noun
noun
NAmE//ɑkˈteɪvoʊ//
 
, NAmE//ɑkˈtɑvoʊ//
 
(pl. octavos)(technology)
 
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a size of a book page that is made by folding each sheet of paper into eight leaves (= 16 pages)
See the Oxford Advanced Learner's Dictionary entry: octavo