sixty-fourmo
six ty-four mo |ˌsikstē ˈfôrmō ˌsɪksti ˈfɔrˌmoʊ | ▶noun ( pl. sixty-fourmos ) a size of book in which each leaf is one sixty-fourth the size of a printing sheet. • a book of this size.
sixty-fourmo |ˌsɪkstɪˈfɔːməʊ | ▶noun ( pl. sixty-fourmos ) a size of book in which each leaf is one sixty-fourth the size of a printing sheet. • a sixty-fourmo book.