Cite
 

Meaning of sixty-fourmo

six•ty-four•mo

Pronunciation: (siks"tē-fôr'mō, -fōr'-), [key]
— n., pl. adj. -mos,
—n.
  1. a book size (about 2 × 3 inches; 5 × 7 cm) determined by printing on sheets folded to form 64 leaves or 128 pages.
  2. a book of this size. Symbol: 64mo, 64°
—adj.
  1. printed, folded, or bound in sixty-fourmo.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.