Word Meaning

octodecimos definition and meaning

a. Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc.
n. A book composed of sheets each of which is folded into eighteen leaves; hence; indicating more or less definitely a size of book, whose sheets are so folded; -- usually written 18mo or 18¡, and called eighteenmo.
pl. of Octodecimo