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bean seed germinating
1. Botany A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf.
2. Anatomy One of the lobules constituting the uterine side of the mammalian placenta, consisting mainly of a rounded mass of villi.
[Latin cotylēdōn, navelwort, from Greek kotulēdōn, from kotulē, hollow object.]
cot′y·le′don·ar′y (-ēd′n-ĕr′ē), cot′y·le′don·al (-ēd′n-əl), cot′y·le′do·nous (-ēd′n-əs) adj.
1. (Botany) a simple embryonic leaf in seed-bearing plants, which, in some species, forms the first green leaf after germination
2. (Zoology) a tuft of villi on the mammalian placenta
[C16: from Latin: a plant, navelwort, from Greek kotulēdōn, from kotulē cup, hollow]
ˌcotyˈledonous, ˌcotyˈledoˌnoid adj
cot•y•le•don(ˌkɒt lˈid n)
the primary or rudimentary leaf of the embryo of seed plants.
[1535–45; < Latin: navelwort < Greek kotylēdṓn literally, a cuplike hollow, derivative of kotýlē cup]
cot`y•le′don•al, cot`y•le′don•ar`y (-ˌɛr i) cot`y•le′don•ous, adj.
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 or absorb food that has been stored in the endosperm for eventual distribution to the growing parts of the embryo. Also called seed leaf. See more at dicotyledon, monocotyledon.
A seed leaf that provides food for an embryo plant.