|1.||a simple embryonic leaf in seed-bearing plants, which, in some species, forms the first green leaf after germination|
|2.||a tuft of villi on the mammalian placenta|
|[C16: from Latin: a plant, navelwort, from Greek kotulēdōn, from kotulē cup, hollow]|
cotyledon cot·y·le·don (kŏt'l-ēd'n)
cotyledon [%PREMIUM_LINK%] (kŏt'l-ēd'n) Pronunciation Key |
A leaf of the embryo of a seed-bearing plant. Most cotyledons emerge, enlarge, and become green after the seed has germinated. Cotyledons either store food for the growing embryo (as in monocotyledons) or absorb food that has been stored in the endosperm (as in other angiosperms) for eventual distribution to the growing parts of the embryo. Also called seed leaf. See more at eudicotyledon, monocotyledon.