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 ?
Establishment of an Agrobacteriuim-mediated cotyledon disc transformation method for Jatropha curcas.
Cotyledons, undehulled soybeans, hulls and fines were separated and further analyzed.
Cotyledons differ morphologically from true leaves in many ways.
azedarach extracts affected reserves mobilization that support embryo growth and as a consequence, the dry biomass of radish cotyledons was higher to that of control when submitted to aqueous extract at 4 %, and not modified at 8 %, the ethanolic extract did not induce any modification of cotyledons dry biomass at 2 and 4 % (Figure 3).
For malformed achenes, it was possible to identify different points of malformation, such as damage to the cotyledons (Figure 2B) and damage to the cotyledons and in the region of the embryonic axis (Figure 2C).
Thus, the cotyledon (Figure 3B) receives two lateral bundles, which are common to both cotyledons, and one large median bundle that is exclusive of each cotyledon.
An improved bioassay for cytokinins using cucumber cotyledons.
12,14,15,16) The reduction in number of cotyledons, placental weight, diameter, and surface area in the present study is consistent with some of the previous studies (Table 3).
After 13 days of infection of the sunflower inbred line 'FU', the zoosporangia and sporangiophores suspensions for 20 single zoosporangium isolates were obtained by grouping all sporulated cotyledons in a small container and adding 1 ml of physiological water for each cotyledon (9g NaCl+1L sterilized water).
The model developed could explain about 77% of the variations in the pH of the cotyledons, suggesting that 23% of the variations were due to other factors not investigated in this work (Table 1).