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 noun Octodecimo  n.  (pl. octodecimos)  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; usually written 18mo or 18°, and called eighteenmo. 
 
 
 
 
 
 Collaborative International Dictionary of English 0.48 
 
 
 
 
 
 
 
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