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twenty-fourmo

[twen-tee-fawr-moh, -fohr-, twuhn-]
noun, plural twen·ty-four·mos.
  1. a book size of about 3 5/8 × 5 1/8 inches (9 × 13 cm), determined by printing on sheets folded to form 24 leaves or 48 pages.
  2. a book of this size. Symbol: 24mo, 24°
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adjective
  1. in twenty-fourmo.
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Origin of twenty-fourmo

First recorded in 1835–45; twenty-four + -mo
Also called vigesimoquarto.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018