Duodecimos

1 definition found

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

  Duodecimo \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[deg].
     [1913 Webster]