Octavo
/ɑːkˈteɪvəʊ,ɑːkˈtɑːvəʊ/
Definition 1 of 2
Pro Tip 1/3Book Sizes
There are different book sizes; 'octavo' is a medium-sized book, suitable for everyday use. 
The bookstore offers the novel in octavo, which fits perfectly in my backpack.
Pro Tip 2/3Print History
'Octavo' also implies a traditional printing technique not commonly used in modern digital printing. 
The vintage octavo editions at the auction were prized for their old-world charm.
Pro Tip 3/3Collectible Items
Octavo books can be desirable collectibles due to their often unique binding and size. 
I collect octavo editions of classic literature because they're beautiful and historic.