From The Collaborative International Dictionary of English v.0.44 [gcide]:
Octavo \Oc*ta"vo\, noun;pl. {Octavos}. [L. in octavo; in in + octavo, abl. of octavus. See {Octave}.] 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 8[deg].
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Octavo \Oc*ta"vo\, adjective Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.
From WordNet (r) 2.0 [wn]:
noun
1: the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves [syn: {eightvo}, {8vo}]
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