twenty-fourmo

[ twen-tee-fawr-moh, -fohr-, twuhn- ]
/ ˌtwɛn tiˈfɔr moʊ, -ˈfoʊr-, ˈtwʌn- /

noun, plural twen·ty-four·mos.

a book size of about 3 5/8 × 5 1/8 inches (9 × 13 centimeters), determined by printing on sheets folded to form 24 leaves or 48 pages.
a book of this size. Symbols: 24mo, 24°

adjective

in twenty-fourmo.

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Also called vi·ges·i·mo‐quar·to [vahy-jes-uh-moh-kwawr-toh] /vaɪˈdʒɛs ə moʊˈkwɔr toʊ/ .

Origin of twenty-fourmo

First recorded in 1835–45; twenty-four + -mo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020