|
Search over 100 encyclopedias and dictionaries: |
Research categories | Follow us on Twitter |
Research categories
View all topics in the newsView all reference sources at Encyclopedia.com |
|||
cotyledon
cotyledon (seed leaf) A part of the embryo in a seed plant. The number of cotyledons is an important feature in classifying plants. Among the flowering plants, the class known as Monocotyledoneae have a single cotyledon and Dicotyledoneae have two. Conifers have either two cotyledons, as in Taxus (yews), or five to ten, as in Pinus (pines). In seeds without an endosperm, e.g. garden pea and broad bean, the cotyledons store food, which is used in germination. In seeds showing epigeal germination, e.g. runner bean, they emerge above the soil surface and become the first photosynthetic leaves.
|
|
|
Cite this article
"cotyledon." A Dictionary of Biology. 2004. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. "cotyledon." A Dictionary of Biology. 2004. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O6-cotyledon.html "cotyledon." A Dictionary of Biology. 2004. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-cotyledon.html |
|
cotyledon
cotyledon , in botany, a leaf of the embryo of a seed . The embryos of flowering plants, or angiosperms , usually have either one cotyledon (the monocots) or two (the dicots). Seeds of gymnosperms, such as pines, may have numerous cotyledons. In some seeds the cotyledons are flat and leaflike; in others, such as the bean, the cotyledons store the seed's food reserve for germination and are fleshy. In most plants the cotyledons emerge above the soil with the seedling as it grows. They differ in form from the true leaves. |
|
|
Cite this article
"cotyledon." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. "cotyledon." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1E1-cotyledo.html "cotyledon." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-cotyledo.html |
|
cotyledon
cot·y·le·don / ˌkätlˈēdn/ • n. Bot. an embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed. DERIVATIVES: cot·y·le·don·ar·y / -ˈēdnˌerē/ adj. |
|
|
Cite this article
"cotyledon." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. "cotyledon." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O999-cotyledon.html "cotyledon." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-cotyledon.html |
|
cotyledon
cotyledon First leaf or pair of leaves produced by the embryo of a flowering plant. Its function is to store and digest food for the embryo plant, and, if it emerges above ground, to photosynthesize for seedling growth. See also dicotyledon; monocotyledon
|
|
|
Cite this article
"cotyledon." World Encyclopedia. 2005. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. "cotyledon." World Encyclopedia. 2005. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O142-cotyledon.html "cotyledon." World Encyclopedia. 2005. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-cotyledon.html |
|
cotyledon
cotyledon A seed leaf that is borne on a plant embryo. Characteristically there is 1 leaf in the monocotyledons, and 2 leaves in the dicotyledons, but there are exceptions, especially in the latter group.
|
|
|
Cite this article
MICHAEL ALLABY. "cotyledon." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "cotyledon." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O7-cotyledon.html MICHAEL ALLABY. "cotyledon." A Dictionary of Plant Sciences. 1998. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-cotyledon.html |
|
cotyledon
cotyledon seed-leaf. XVIII. — L. cotylēdon navelwort, pennywort — Gr. kotúlēdṓn applied to various cup-shaped cavities, f. kotúlē hollow, cup.
|
|
|
Cite this article
T. F. HOAD. "cotyledon." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. T. F. HOAD. "cotyledon." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O27-cotyledon.html T. F. HOAD. "cotyledon." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-cotyledon.html |
|
cotyledon
cotyledon (kot-i-lee-dŏn) n. any of the major convex subdivisions of the mature placenta. Each cotyledon contains a major branch of the umbilical blood vessels.
|
|
|
Cite this article
"cotyledon." A Dictionary of Nursing. 2008. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. "cotyledon." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O62-cotyledon.html "cotyledon." A Dictionary of Nursing. 2008. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-cotyledon.html |
|
cotyledon
cotyledon
•Abaddon, gladden, gladdon, Ibadan, madden, sadden
•abandon, Brandon, Rwandan, Ugandan
•Baden, Baden-Baden, Coloradan, garden, harden, lardon, Nevadan, pardon
•Wiesbaden • bear garden
•tea garden
•Armageddon, deaden, leaden, redden
•Eldon, Sheldon
•Brendan, tendon
•Dresden
•Aden, Aidan, Haydn, laden, maiden
•handmaiden
•cedarn, cotyledon, dicotyledon, Eden, monocotyledon, Sweden
•wealden
•bestridden, forbidden, hidden, midden, outridden, ridden, stridden, unbidden
•Wimbledon
•linden, Lindon, Swindon
•Wisden • Mohammedan • Myrmidon
•harridan • hagridden • Sheridan
•bedridden • Macedon • Huntingdon
•Dryden, guidon, Leiden, Poseidon, Sidon, widen
•Culloden, hodden, modern, sodden, trodden
•Cobden • downtrodden
•Auden, broaden, cordon, Gordon, Hordern, Jordan, warden
•churchwarden • louden • bounden
•loden, Snowdon
•beholden, embolden, golden, olden
•hoyden • Bermudan • wooden
•Mukden • gulden • sudden
•Blunden, London
•Riordan • bourdon • bombardon
•celadon • Clarendon
•burden, guerdon
|
|
|
Cite this article
"cotyledon." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. 26 May. 2012 <http://www.encyclopedia.com>. "cotyledon." Oxford Dictionary of Rhymes. 2007. Encyclopedia.com. (May 26, 2012). http://www.encyclopedia.com/doc/1O233-cotyledon.html "cotyledon." Oxford Dictionary of Rhymes. 2007. Retrieved May 26, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O233-cotyledon.html |
|
|
Search over 100 encyclopedias and dictionaries:
HighBeam™ Research, Inc. © Copyright 2012. All rights reserved.
The Encyclopedia.com advertising network includes:
