octodecimo means A size of a sheet of paper resulting from folding and cutting a sheet of paper into eighteenths (3.5"–4.5" x 4.9"–5.9").
Etymology
From Latin ablative of octusdecimus (“eighteenth”).
noun
- A size of a sheet of paper resulting from folding and cutting a sheet of paper into eighteenths (3.5"–4.5" x 4.9"–5.9").
- A book consisting of pages of that size.