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[ok-tey-voh, -tah-] /ɒkˈteɪ voʊ, -ˈtɑ-/

noun, plural octavos for 2.
a book size of about 6 × 9 inches (16 × 23 cm), determined by printing on sheets folded to form 8 leaves or 16 pages. Symbol: 8vo, 8°.
a book of this size.
in octavo.
noun (pl) -vos
Also called eightvo. a book size resulting from folding a sheet of paper of a specified size to form eight leaves: demi-octavo Often written 8vo, 8°
a book of this size
(formerly) a size of cut paper 8 inches by 5 inches (20.3 cm by 12.7 cm)

1580s, printer’s word for sheets folded to make eight leaves, from Latin in octavo “in the eighth,” ablative of octavus “eighth” (see octave). Abbreviation is 8vo.


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  • Octennial

    [ok-ten-ee-uh l] /ɒkˈtɛn i əl/ adjective 1. occurring every eight years. 2. of or for eight years. /ɒkˈtɛnɪəl/ adjective 1. occurring every eight years 2. lasting for eight years

  • Octet

    [ok-tet] /ɒkˈtɛt/ noun 1. a company of eight singers or musicians. 2. a musical composition for eight voices or instruments. 3. Prosody. (def 4). 4. any group of eight. /ɒkˈtɛt/ noun 1. any group of eight, esp eight singers or musicians 2. a piece of music composed for such a group 3. (prosody) another word […]

  • Octet rule

    noun in chemistry, the statement that when atoms combine to form molecules they generally each lose, gain, or share valence electrons until they attain or share eight; also called Lewis rule of eight

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