Oc‐ta″vo (?), n.;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°.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.