Meaning of OCTAVO in English

OCTAVO

n. (pl. -os) 1 a size of book or page given by folding a standard sheet three times to form a quire of eight leaves. 2 a book or sheet of this size. °Abbr.: 8vo.

[ L in octavo in an eighth f. octavus eighth ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.