Definition:
- (n.) A book composed of sheets each of which is folded into eight leaves; hence, indicating more or less definitely a size of book so made; -- usually written 8vo or 8ยก.
- (a.) Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.
Compare octavo with other words:
foolscap vs. octavo
inch vs. octavo
octave vs. octavo