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twentymo

[twen-tee-moh, twuhn-] /ˈtwɛn tiˌmoʊ, ˈtwʌn-/
noun, plural twentymos.
1.
a book size of about 3 × 5 inches (8 × 12 cm), determined by printing on sheets folded to form 20 leaves or 40 pages.
2.
a book of this size. Symbol: 20mo, 20°.
adjective
3.
in twentymo.
Also called vigesimo.
Origin
1835-1845
1835-45; twenty + -mo
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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