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octavo

oc·ta·vo [ ok táyvō, ok tvō ] (plural oc·ta·vos)


noun 
Definition:
 
1. book size: a book with pages of a size traditionally created by folding a single sheet of standard-sized printing paper in half three times, giving 8 leaves or 16 pages

2. page size: the page size of an octavo book

[Late 16th century. < Latin, "in an eighth (of a sheet)" < octavus (see octave); from the folding of a sheet eight times]
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