n. Any plant in what used to be the Dicotyledones.
the GNU version of the Collaborative International Dictionary of English
n. A plant whose seeds divide into two seed lobes, or cotyledons, in germinating.
The Century Dictionary and Cyclopedia
n. A plant which produces an embryo having two cotyledons.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. flowering plant with two cotyledons; the stem grows by deposit on its outside
Word Usage
""cotyledon" and "dicotyledon" -- I should not have been surprised; but they blundered over the ordinary English, and had next to no sense of the meaning of punctuation."