octavo

oc·ta·vo  (k-tv, -tä-)

n. pl. oc·ta·vos In both senses also called eightvo.

1. The page size, from 5 by 8 inches to 6 by 9 ¹/₂ inches, of a book composed of printer's sheets folded into eight leaves.

2. A book composed of octavo pages.

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[Medieval Latin (in) octv, (in) an eighth, from Latin, ablative sing. of octvus, eighth, from oct, eight; see okt(u) in Indo-European roots.]

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octavo

Noun

pl -vos

1. a book size resulting from folding a sheet of paper of a standard size to form eight leaves

2. a book or sheet of this size [New Latin in octavo in an eighth (of a sheet)]

Thesaurus

Noun

1.

octavo - the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves 8vo, eightvo size - the property resulting from being one of a series of graduated measurements (as of clothing); "he wears a size 13 shoe"