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Adjective: octodecimo  ,ók-tu'de-su,mow
  1. Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc
Noun: octodecimo  ,ók-tu'de-su,mow
  1. A book composed of sheets each of which is folded into eighteen leaves
    - eighteenmo

Derived forms: octodecimos