octodecimo


octodecimo
octodecimo or 18 mo [äk΄tō des′ə mō΄]
n.
pl. octodecimos [< L (in) octodecimo, (in) eighteen, abl. of octodecimus, eighteenth]
1. a page size (about 4 by 6 1/ 2 in), 1/ 18 of a printer's sheet
2. a book with pages of this size: Also called eighteenmo, and written 18mo or 18°
adj.
with pages of this size

English World dictionary. . 2014.