n.
A flowering plant with two embryonic seed leaves or cotyledons that usually appear at germination.
dicotyledonous di'cot'y·le'don·ous (-l-ēd'n-əs) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.