WordNet (r) 3.0 (2006):

subclass Dilleniidae
    n 1: a group of families of more or less advanced trees and
         shrubs and herbs having either polypetalous or gamopetalous
         corollas and often with ovules attached to the walls of the
         ovary; contains 69 families including Ericaceae and
         Cruciferae and Malvaceae; sometimes classified as a
         superorder [syn: Dilleniidae, subclass Dilleniidae]