A cotyledon (; "seed leaf" from Greek: κοτυληδών kotylēdōn, from κοτύλη kotýlē "cup, bowl")'s a significant part of the embryo within the seed of a plant. Upon germination, the cotyledon may become the embryonic first leaves of a seedling. The number of cotyledons present's one characteristic used by botanists to classify the flowering plants (angiosperms). Species with one cotyledon are called monoco… (More on Cotyledon)