Cotyledon
a genus of plants, order Crassulaceæ. Calyx, 5-partite; petals, united into a tubular or campanulate corolla; stamens 10, inserted in the tube of the corolla. C. umbilicus is a succulent plant with pendulous cylindrical flowers of a yellowish-green color. It is from 6 to 12 inches high.
The word is also applied to the first leaf, or one of the first two leaves, de- COUGAR In some cases they are absent; at other times they cohere instead of unfolding.