cotyledon

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Related to Cotyledons: angiosperm, Monocotyledons, Dicotyledons

cotyledon

 [kot″ĭ-le´don]
1. any subdivision of the uterine surface of the placenta.
2. irregular convex areas on the chorionic surface of the placenta, consisting of two or more stem villi and their many branch villi; by the end of the fourth month the decidua basalis is almost entirely replaced by the cotyledons.

cot·y·le·don

(kot'i-lē'don),
1.
2. In plants, a seed leaf, the first leaf to grow from a seed.
3. A placental unit.
[G. kotylēdon, any cup-shaped hollow]

cotyledon

/cot·y·le·don/ (kot″ĭ-le´d'n)
1. the seed leaf of the embryo of a plant.
2. any subdivision of the uterine surface of the placenta.

cotyledon

(kŏt′l-ēd′n)
n.
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.

cot′y·le′don·ar′y (-ēd′n-ĕr′ē), cot′y·le′don·al (-ēd′n-əl)(-ēd′n-əs), cot′y·le′do·nous (-ēd′n-əs) adj.

cotyledon

[kot′ilē′don]
Etymology: Gk, kotyledon, cup-shaped
one of the visible segments on the maternal surface of the placenta. A typical placenta may have 15 to 28 cotyledons, each consisting of fetal vessels, chorionic villi, and intervillous space.

cot·y·le·don

(kot'i-lē'dŏn)
1. In plants, a seed leaf, the first leaf to grow from a seed.
2. Irregular convex area of the fetal part of the placenta composed of stem villi.
[G. kotylēdon, any cup-shaped hollow]

cotyledon

  1. a part of the plant embryo in the form of a specialized seed leaf that can be thin and papery, as in the castor oil plant, or can act as a storage organ, as in the broad bean, absorbing food from the endosperm. Sometimes it also functions as a leaf after EPIGEAL germination, as in the runner bean. Some ANGIOSPERMS have one cotyledon per seed (MONOCOTYLEDONS) while others have two (DICOTYLEDONS).
  2. a part of the mammalian placenta on which a tuft of villi occurs, particularly in ruminants.

Cotyledon

African genus of the plant family Crassulaceae; contains bufadienolide, cardiac glycosides; causes krimpsiekte (cotyledonosis). Includes C. orbiculata (C. decusata, C. leucophylla), C. umbilicus (Umbilicus rupestris, navelwort, pennywort). Many species have been reclassified as Tylecodon spp.

cotyledon

1. any subdivision of the uterine surface of the human placenta.
2. discrete elevations of chorioallantoic tissue of the ruminant fetal membranes that adhere intimately with the maternal caruncles to form placentomes. See also caruncle.
References in periodicals archive ?
Fruit a septicidal capsule, sometimes partly loculicidal as well; seeds with testa cells [+ or -] isodiametric to elongated; embryo with 2 cotyledons.
The cotyledons of some nut species contain significant quantities of polyphenols (condensed or hydrolyzable tannins) (e.
Key nutrients measured were ascorbic acid (vitamin C), tocopherols (vitamin E), phylloquinone (vitamin K), and beta-carotene (a vitamin A precursor), plus other related carotenoids in the cotyledons.
Complementary to the role of KNOX1 genes in promoting meristematic activity is the function of NO APICAL MERISTEM and CUP SHAPE COTYLEDON (NAM/CUC3) genes, which act as markers of leaf primordium boundaries and leaf dissection zones (Berger et al.
5] Gambley RL & Dodd WA (1990) An in vitro technique for the production of de novo multiple shoots in cotyledon explants of cucumber (Cucumis sativa L.
Promotion of radish cotyledon enlargement and reducing sugar content by zeatin and red light.
L) Grown in Municipal Water Sewage Water Concentration (%) In Control Cotyledons Mean [+ or -] SD Protein (mg/g dry 2.
Cotyledons can support energy and nutrient demands of a young seedling either as photosynthetic or reserve organs (Kitajima 2003).
Ethylene inhibitors enhanced de novo shoot regeneration from cotyledons of Brassica campestris spp.
Using a patented process, researchers separate the testa and endosperm from the cotyledons.
In addition to the agaves, San Marcos is adding other notable and exotic succulents to its list, including aloes, cotyledons, dyckias, echeverias and yuccas.