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 centimeters), determined by printing on sheets folded to form 24 leaves or 48 pages.
2. a book of this size. : 24mo, 24°

adjective

1. in twenty-fourmo.

Word History and Origins

Origin of twenty-fourmo¹

First recorded in 1835–45; twenty-four + -mo