资料来源 : Webster's Revised Unabridged Dictionary (1913)

Sextodecimo \Sex`to*dec"imo\, n.; pl. {Sextodecimos}.
   A book composed of sheets each of which is folded into
   sixteen leaves; hence, indicating, more or less definitely, a
   size of a book; -- usually written 16mo, or 16[deg].