Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of eighteenmo is as below...

#NAME? :: -mo () A suffix added to the names of certain numerals or to the numerals themselves, to indicate the number of leaves made by folding a sheet of paper; as, sixteenmo or 16mo; eighteenmo or 18mo. It is taken from the Latin forms similarly used; as, duodecimo, sextodecimo, etc. A small circle, placed after the number and near its top, is often used for -mo; as, 16�, 18�, etc..

Eighteenmo :: Eighteenmo (a. & n.) See Octodecimo.

Octodecimo :: Octodecimo (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..

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