Sextodecimos

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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].
     [1913 Webster]