- a page size (about 4 by 6 in), of a printer's sheet
- a book with pages of this size
Origin of octodecimo; from Classical Latin (in) octodecimo, (in) eighteen, ablative of octodecimus, eighteenth
with pages of this size
- The page size, 4 by 6.5 inches, of a book composed of printer's sheets folded into 18 leaves or 36 pages.
- A book composed of octodecimo pages. In both senses also called eighteenmo.
Origin of octodecimoLate Latin (in) oct&omacron;decim&omacron;, (in) an eighteenth, ablative sing. of oct&omacron;decimus, eighteenth, from Latin oct&omacron;decim, eighteen : oct&omacron;, eight; see okt&omacron;(u) in Indo-European roots + decem, ten; see dek&mlowring; in Indo-European roots.
- (paper, printing) 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").
- (printing) A book consisting of pages of that size.