dicotyledon

[dahy-kot-l-eed-n, dahy-kot-l-]
noun Botany.
any angiospermous plant of the class (or subclass) Dicotyledoneae, producing seeds with two cotyledons and having an exogenous manner of growth.
Compare monocotyledon.


Origin:
1720–30; < Neo-Latin Dicotyledones a pre-Linnean grouping of such plants. See di-1, cotyledon

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Collins
World English Dictionary
dicotyledon (daɪˌkɒtɪˈliːdən, ˌdaɪkɒt-)
 
n
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
 
dicoty'ledonous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
dicotyledon (dī'kŏt'l-ēd'n) or dicot  [%PREMIUM_LINK%]     (dī'kŏt'l-ēd'n)  Pronunciation Key 
An angiosperm that is not a monocotyledon, having two cotyledons in the seed. The term dicotyledon serves as a convenient label for the eudicotyledons, the magnoliids, and a varied group of other angiosperms, but it does not correspond to a single taxonomic group. Compare monocotyledon. See more at eudicotyledon, leaf, magnoliid.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

dicotyledon

any member of the flowering plants, or angiosperms, that has a pair of leaves, or cotyledons, in the embryo of the seed. There are about 175,000 known species of dicots. Most common garden plants, shrubs and trees, and broad-leafed flowering plants such as magnolias, roses, geraniums, and hollyhocks are dicots.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Response of five tropical dicotyledon species to natural solar ultraviolet-B radiation.
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