n. (pl. -os) 1 a size of book or page given by folding a standard sheet into eighteen leaves. 2 a book or sheet of this size.
[ in octodecimo f. L octodecimus eighteenth ]
n. (pl. -os) 1 a size of book or page given by folding a standard sheet into eighteen leaves. 2 a book or sheet of this size.
[ in octodecimo f. L octodecimus eighteenth ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012