Source : WordNet®

Magnoliopsida
     n : comprising seed plants that produce an embryo with paired
         cotyledons and net-veined leaves; divided into six (not
         always well distinguished) subclasses (or superorders):
         Magnoliidae and Hamamelidae (considered primitive);
         Caryophyllidae (an early and distinctive offshoot); and
         three more or less advanced groups: Dilleniidae; Rosidae;
         Asteridae [syn: {Dicotyledones}, {class Dicotyledones}, {Dicotyledonae},
          {class Dicotyledonae}, {class Magnoliopsida}]