Dicotyledonae \Dicotyledonae\ n. (Bot.) a class of plants comprising those seed plants that produce an embryo with two 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, class Dicotyledonae, Magnoliopsida, class Magnoliopsida. [WordNet 1.5]

Source: The Collaborative International Dictionary of English v.0.48
 

Dilleniidae \Dilleniidae\ n. 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; it contains 69 families including Ericaceae and Cruciferae and Malvaceae; it is sometimes classified as a superorder.

Syn: subclass Dilleniidae. [WordNet 1.5]

Source: The Collaborative International Dictionary of English v.0.48
 

Dilleniidae

Source: WordNet (r) 2.0