octodecimo


octodecimo
adj. in octodecimo, having 18 leaves oc·to·dec·i·mo || ‚ɑktəʊ'desɪməʊ /‚ɒk- n. book composed of sheets folded into 18 leaves or 36 pages, 4 X 6 1/2 inch book with 18 pages

English contemporary dictionary. 2014.