Eighteenmo meaning

ā-tēn'mō
The page size of a book made up of printer's sheets folded into eighteen leaves, each leaf being approximately 4 by 612 inches.
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A book consisting of pages of this size.
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adjective
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Octodecimo (as a paper size in printing).
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Origin of eighteenmo

From 18mo abbr. of octodecimo