octavo

(äk tā′vō, -tä′-)

noun pl. octavos

the page size of a book made up of printer's sheets folded into eight leaves: the usual size of each leaf is 6 by 9 inches
a book consisting of pages of this size

Origin: < L (in) octavo, (in) eight, abl. of octavus: see octave

adjective

consisting of pages of this size

See octavo in American Heritage Dictionary 4

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

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.
A book composed of octavo pages.

Origin:

Origin: Medieval Latin (in) octāvō, (in) an eighth

Origin: , from Latin

Origin: , ablative sing. of octāvus, eighth

Origin: , from octō, eight; see oktō(u) in Indo-European roots

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