GNU Collaborative International Dictionary of English

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Found 2 definitions

1.       
   Octavo , 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°.
   1913 Webster
         
       

2.       
   Octavo, a. Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.
   1913 Webster