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twentymo

[ twen-tee-moh, twuhn- ]

noun

, plural twen·ty·mos.
  1. a book size of about 3 × 5 inches (8 × 12 centimeters), determined by printing on sheets folded to form 20 leaves or 40 pages.
  2. a book of this size. : 20mo, 20°


adjective

  1. in twentymo.
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Word History and Origins

Origin of twentymo1

First recorded in 1835–45; twenty + -mo

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Twenty-fourth Amendmenttwenty-nine