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octodecimo

oc·to·dec·i·mo [ òktō déssəmō ] (plural oc·to·dec·i·mos)


noun 
Definition:
 
book size: a book size of about 10 by 16 cm (4 by 4 1/4 in.), or a book of this size

[Mid-19th century. < Latin, "in an eighteenth (of a sheet)" < octodecim "eight and ten"; from the folding of a sheet 18 times]
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