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
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