Ŏc-tā'vo1, a.
a. [See infra.] Formed of sheets folded so as to make eight leaves; of, or equal to, the size of one leaf of a sheet of printing paper folded so as to make eight leaves; as, an octavo book.
2 entries under this word
Octavo
Ŏc-tā'vo2, n.
n.; pl. Ŏc-TĀ'vōs. [Fr. & Sp. octavo, It. ottavo, from Lat. in octavo, from octavus. See supra.] 1. A book composed of sheets folded so as to make eight leaves; an octavo book. 2. The size of a book thus composed;—usually indicated thus: 8vo., or 8°.