[dahy-kot-l-eed-n-uhs, dahy-kot-l-]
belonging or pertaining to the Dicotyledoneae; having two cotyledons.

1785–95; dicotyledon + -ous

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World English Dictionary
dicotyledon (daɪˌkɒtɪˈliːdən, ˌdaɪkɒt-)
1.  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
2.  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

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Example sentences
Suppose there were no way to observe the development of two dicotyledonous plants from their seeds-the apple tree and the bean.
Although protein expression in dicotyledonous plant cells was enabled, the claims covered any plant cell.
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