Definition of sixty-fourmo in English:

sixty-fourmo

Syllabification: six·ty-four·mo
Pronunciation: /ˌsikstē ˈfôrmō
 
/

noun (plural sixty-fourmos)

1A size of book in which each leaf is one sixty-fourth the size of a printing sheet.
1.1A book of sixty-fourmo size.

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Word of the day punctum
Pronunciation: ˈpəNGktəm
noun
a small, distinct point