Definitions for cotyledon
ˌkɒt lˈid ncotyle·don

Princeton's WordNetRate this definition:0.0 / 0 votes

1. cotyledon, seed leafnoun

   embryonic leaf in seed-bearing plants

WiktionaryRate this definition:4.5 / 2 votes

1. cotyledonnoun

   The leaf of the embryo of a seed-bearing plant; after germination it becomes the first leaves of the seedling.

WikipediaRate this definition:0.0 / 0 votes

1. Cotyledon

   A cotyledon (; lit. 'seed leaf'; from Latin cotyledon; from κοτυληδών (kotulēdṓn), gen. κοτυληδόνος (kotulēdónos), from κοτύλη (kotýlē) 'cup, bowl') is a significant part of the embryo within the seed of a plant, and is defined as "the embryonic leaf in seed-bearing plants, one or more of which are the first to appear from a germinating seed." The number of cotyledons present is one characteristic used by botanists to classify the flowering plants (angiosperms). Species with one cotyledon are called monocotyledonous ("monocots"). Plants with two embryonic leaves are termed dicotyledonous ("dicots"). In the case of dicot seedlings whose cotyledons are photosynthetic, the cotyledons are functionally similar to leaves. However, true leaves and cotyledons are developmentally distinct. Cotyledons are formed during embryogenesis, along with the root and shoot meristems, and are therefore present in the seed prior to germination. True leaves, however, are formed post-embryonically (i.e. after germination) from the shoot apical meristem, which is responsible for generating subsequent aerial portions of the plant. The cotyledon of grasses and many other monocotyledons is a highly modified leaf composed of a scutellum and a coleoptile. The scutellum is a tissue within the seed that is specialized to absorb stored food from the adjacent endosperm. The coleoptile is a protective cap that covers the plumule (precursor to the stem and leaves of the plant). Gymnosperm seedlings also have cotyledons. Gnetophytes, cycads, and ginkgos all have 2, whereas in conifers they are often variable in number (multicotyledonous), with 2–24 cotyledons forming a whorl at the top of the hypocotyl (the embryonic stem) surrounding the plumule. Within each species, there is often still some variation in cotyledon numbers, e.g. Monterey pine (Pinus radiata) seedlings have 5–9, and Jeffrey pine (Pinus jeffreyi) 7–13 (Mirov 1967), but other species are more fixed, with e.g. Mediterranean cypress always having just two cotyledons. The highest number reported is for big-cone pinyon (Pinus maximartinezii), with 24 (Farjon & Styles 1997). Cotyledons may be ephemeral, lasting only days after emergence, or persistent, enduring at least a year on the plant. The cotyledons contain (or in the case of gymnosperms and monocotyledons, have access to) the stored food reserves of the seed. As these reserves are used up, the cotyledons may turn green and begin photosynthesis, or may wither as the first true leaves take over food production for the seedling.

ChatGPTRate this definition:0.0 / 0 votes

1. cotyledon

   A cotyledon is a significant part of the embryo within the seed of a plant. It is the first part that emerges from the germinating seed and becomes the embryonic version of a leaf. The number of cotyledons in a seed helps classify the plant as a monocot or a dicot. Monocots have one cotyledon, while dicots have two.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Cotyledonnoun

   one of the patches of villi found in some forms of placenta

2. Cotyledonnoun

   a leaf borne by the caulicle or radicle of an embryo; a seed leaf

3. Etymology: [Gr. a cupshaped hollow, fr. . See Cotyle.]

WikidataRate this definition:5.0 / 1 vote

1. Cotyledon

   A cotyledon is 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 is one characteristic used by botanists to classify the flowering plants. Species with one cotyledon are called monocotyledonous. Plants with two embryonic leaves are termed dicotyledonous and placed in the class Magnoliopsida. In the case of dicot seedlings whose cotyledons are photosynthetic, the cotyledons are functionally similar to leaves. However, true leaves and cotyledons are developmentally distinct. Cotyledons are formed during embryogenesis, along with the root and shoot meristems, and are therefore present in the seed prior to germination. True leaves, however, are formed post-embryonically from the shoot apical meristem, which is responsible for generating subsequent aerial portions of the plant. The cotyledon of grasses and many other monocotyledons is a highly modified leaf composed of a scutellum and a coleoptile. The scutellum is a tissue within the seed that is specialized to absorb stored food from the adjacent endosperm. The coleoptile is a protective cap that covers the plumule.

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Cotyledon

   kot-i-lē′don, n. (bot.) the term applied to the seed-leaves of the embryo: the seed-leaf.—adjs. Cotylē′donary; Cotylē′donous, pertaining to or having cotyledons or seed-lobes; Cot′yloid, cup-shaped. [L.,—Gr. kotylēdōn—kotylē, a cup.]

U.S. National Library of MedicineRate this definition:5.0 / 1 vote

1. Cotyledon

   A part of the embryo in a seed plant. The number of cotyledons is an important feature in classifying plants. In seeds without an endosperm, they store food which is used in germination. In some plants, they emerge above the soil surface and become the first photosynthetic leaves. (From Concise Dictionary of Biology, 1990)

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How to pronounce cotyledon?

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Numerology

1. Chaldean Numerology

   The numerical value of cotyledon in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of cotyledon in Pythagorean Numerology is: 5

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=cotyledon
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Cotyledon
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Cotyledon
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/cotyledon
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=cotyledon
7. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=cotyledon