duo·dec·i·mo /-ˌmo/
十二開,十二開的書(a.)十二開的
Du·o·dec·i·mo a. Having twelve leaves to a sheet; as, a duodecimo from, book, leaf, size, etc.
Du·o·dec·i·mo, n.; pl. Duodecimos A book consisting of sheets each of which is folded into twelve leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 12mo or 12°.
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