18mo definition, 18mo meaning | English dictionary

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      n   pl   , -mos  
1      (Also called)    octodecimo   a book size resulting from folding a sheet of paper into 18 leaves or 36 pages,   (Often written)    18mo, 18°         
2    a book of this size  
English Collins Dictionary - English Definition & Thesaurus  
See also:

12mo, 16mo, 18°, 12°

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