sixty-fourmo Syllabification: (six·ty-four·mo)Pronunciation: /ˌsikstē ˈfôrmō/Definition of sixty-fourmo noun (plural sixty-fourmos) a size of book in which each leaf is one sixty-fourth the size of a printing sheet. a book of sixty-fourmo size. sixty-fourmo in other Oxford dictionaries Definition of sixty-fourmo in the British & World English dictionary
