cotyledon defined in 1951 yearcotyledon - cotyledon;
cotyledon - Leaf, forming part of embryo of seeds; much simpler in structure than later formed leaves and usually lacking chlorophyll. Monocotyledons have one, dicotyledons two cotyledons in each seed. In gymnosperms the number varies. Cotyledons play an important part in the early stages of seedling development. In some seeds, e.g. peas, beans, they are storage organs from which the seedling draws food; in other seeds, e.g. grasses, food stored in another part of the seed, the endosperm, is absorbed by the cotyledons and passed on to the seedling. In addition, the cotyledons of many plants later appear above ground, develop chlorophyll, and synthesize food material by photosynthesis.
near cotyledon in Knolik
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