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°, and called eighteenmo.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.