a. [ L. in quarto in fourth, from quartus the fourth: cf. F. (in) quarto. See Quart. ] Having four leaves to the sheet; of the form or size of a quarto. [ 1913 Webster ]
n.;
a. [ L. vigesimus quartus twenty-fourth. Cf. Duodecimo. ] Having twenty-four leaves to a sheet;
n.;