- any angiospermous plant of the class (or subclass) Dicotyledoneae, producing seeds with two cotyledons and having an exogenous manner of growth.
- any flowering plant of the class Dicotyledonae, normally having two embryonic seed leaves and leaves with netlike veins. The group includes many herbaceous plants and most families of trees and shrubs
- primitive dicotyledon . any living relative of early angiosperms that branched off before the evolution of monocotyledons and eudicotyledons. The group comprises about 5 per cent of the world's plants
