sixty-fourmo

American  

[siks-tee-fawr-moh, -fohr-] / ˌsɪks tiˈfɔr moʊ, -ˈfoʊr- /

noun

plural

sixty-fourmos

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°

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adjective

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

sixty-fourmo British  

/ ˌsɪkstɪˈfɔːməʊ /

noun

1. Often written: 64mo.   64°.  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

2. a book of this size

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Etymology

Origin of sixty-fourmo

sixty-four + -mo