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Definition of Octodecimo
1. a. Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc.
2. 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.
Medical Definition of Octodecimo
1. Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc. Origin: L. Octodecim eighteen. See Octavo, Decimal, and -mo. Source: Websters Dictionary (01 Mar 1998)