sixty-fourmo

[ siks-tee-fawr-moh, -fohr- ]

noun

, plural six·ty-four·mos.

1. a book size (about 2 × 3 inches; 5 × 7 centimeters) determined by printing on sheets folded to form 64 leaves or 128 pages.
2. a book of this size. : 64mo, 64°

adjective

1. printed, folded, or bound in sixty-fourmo.

sixty-fourmo

/ ˌsɪkstɪˈfɔːməʊ /

noun

1. a book size resulting from folding a sheet of paper into 64 leaves or 128 pages, each one sixty-fourth the size of the sheet Often written64mo64°
2. a book of this size

Word History and Origins

Origin of sixty-fourmo¹

sixty-four + -mo