forty-eightmo

[ fawr-tee-eyt-moh ]

noun

, plural for·ty-eight·mos

1. a book size of about 2½ × 4 inches (6 × 10 centimeters), determined by printing on sheets folded to form 48 leaves or 96 pages. : 48mo, 48°
2. a book of this size.

adjective

1. in forty-eightmo.

Word History and Origins

Origin of forty-eightmo¹

First recorded in 1885–90; forty-eight + -mo