quadragesimo-octavo
noun
°(paper) A paper size, (2.5"-3.1" x 2.5"-3.3"), one forty-eighth of a standard uncut flat sheet.
°A book size, (2.5"-3.1" x 2.5"-3.3"), corresponding to the paper size.
synonyms: 48mo, forty-eightmo, 48°, fe