octavo Meaning, Definition & Usage

  1. noun the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves
    8vo; eightvo.

WordNet

Oc*ta"vo noun
Etymology
L. in octavo; in in + octavo, abl. of octavus. See Octave.
Wordforms
plural Octavos
Definitions
  1. 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°.
Oc*ta"vo adjective
Definitions
  1. Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.

Webster 1913