Cotyledon
COTYLEDON, noun [Gr., a hollow or cavity.]
1. In botany, the perishable lobe or placenta of the seeds of plants. It involves and nourishes the embryo plant, and then perishes. Some seeds have two lobes; others one only, and others none.
2. In anatomy, a little glandular body adhering to the chorion of some animals.
3. A genus of plants, navel-wort, or kidney-wort, of several species.