the GNU version of the Collaborative International Dictionary of English
adj. Having two cotyledons or seed lobes.
The Century Dictionary and Cyclopedia
In botany, having two cotyledons: as, a dicotyledonous embryo, seed, or plant.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. (of a flowering plant) having two cotyledons in the seed
Word Usage
""No, dear, not every one; plants are divided into two kinds: those which have two food leaves, like these plants, and those which have only one; these are called dicotyledonous, and the ones which have but one food leaf are monocotyledonous."