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Listen to native speakers pronounce “octodecimo” in real conversational contexts with synchronized timestamps and subtitles.
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Having eighteen leaves to a sheet; as, an octodecimo form, book, leaf, size, etc. 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 18º, and called eighteenmo.
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