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octodecimo
From The Collaborative International Dictionary of English v.0.48:
Octodecimo \Oc`todec"i*mo\, a. [L. octodecim eighteen. See Octavo, Decimal, and -mo.] Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc. [1913 Webster] .
From The Collaborative International Dictionary of English v.0.48:
Octodecimo \Oc`to*dec"i*mo\, 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[deg], and called eighteenmo. [1913 Webster]
