Definitions for "Cotyledons"
First leaves developed in the embryo of a seed.
A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges and becomes green. Also called seed leaf.
The cotyledons are the leaf-like structures in the seed. In a dicot seed, there are two halves to the seed as in a bean. These two halves are the seed leaves of the bean seed. In the corn seed, there is only one seed leaf, thus the seed is not divided into two halves. DIAGRAMS: Cotyledons / Acorn PHOTOS