sixty-fourmo

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌsɪkstɪˈfɔːməʊ/US:USA pronunciation: respellingUSA pronunciation: respelling(siks′tē fôr′mō, -fōr′-)


WordReference Random House Unabridged Dictionary of American English © 2026
six•ty-four•mo  (siks′tē fôr′mō, -fōr′-),USA pronunciation n., pl. -mos, adj. 
n. 
  1. Printinga book size (about 2 × 3 inches;
    5 × 7 cm) determined by printing on sheets folded to form 64 leaves or 128 pages.
  2. Printinga book of this size. Symbol: 64mo, 64°

adj. 
  1. Printingprinted, folded, or bound in sixty-fourmo.
  • sixty-four + -mo

Collins Concise English Dictionary © HarperCollins Publishers::
sixty-fourmo /ˌsɪkstɪˈfɔːməʊ/ n ( pl -mos)
  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 sheetOften written: 64mo, 64°

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