18 Definition
noun
(paper) Abbreviation of octodecimo, a page size (3.5"-4.5" x 4.9"-5.9").
Wiktionary
(printing) Abbreviation of octodecimo, a book size using octodecimo-sized pages.
Wiktionary
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(paper) Abbreviation of octodecimo, a page size (3.5"-4.5" x 4.9"-5.9").
(printing) Abbreviation of octodecimo, a book size using octodecimo-sized pages.