twentymo

[ twen-tee-moh, twuhn- ]
/ ˈtwɛn tiˌmoʊ, ˈtwʌn- /

noun, plural twen·ty·mos.

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

adjective

in twentymo.

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Also called vigesimo.

Origin of twentymo

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