GNU Collaborative International Dictionary of English

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Found one definition

1.       
   eightvo n. the size of a book (ca. 16 x 23 cm) whose pages are made by folding a sheet of paper three times to form eight leaves.  The pages have about half the area of a quarto. Symbolized as 8vo, and 8°.
   
   Syn. -- octavo, 8vo, 8°.
   
   [WordNet 1.5 +PJC]