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octodecimo - Meaning and Examples

Meaning of 'octodecimo' (Webster Dictionary)

1 . Octodecimo [ a.]
- Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc.
2 . 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.