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Noun: octodecimo  `ók-tu'de-su`mow
  1. 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
Adjective: octodecimo  `ók-tu'de-su`mow
  1. Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc

Derived forms: octodecimos