sexagesimo-quarto

Etymology
From ablatives of  and.

Noun

 * 1)  A paper size, (1.87"-2.5" x 2.5"-3.125"), one sixty-fourth of a standard uncut flat sheet.
 * 2)  A book size, (1.87"-2.5" x 2.5"-3.125"), corresponding to the paper size.

Synonyms

 * 64mo, sixty-fourmo, 64º
 * Sf, 64mo, sixty-fourmo, 64º