Octodecimo

noun

Definitions

Noun
  1. 1
    A size of a sheet of paper resulting from folding and cutting a sheet of paper into eighteenths (3.5"–4.5" x 4.9"–5.9").
  2. 2
    A book consisting of pages of that size.

Etymology

From Latin ablative of octusdecimus (“eighteenth”).

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