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cotyledon

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cot⋅y⋅le⋅don

[kot-l-eed-n]
–noun Botany.
1. the primary or rudimentary leaf of the embryo of seed plants.
2. Anatomy. any of several lobules of the placenta.

Origin:
1535–45; < L: navelwort < Gk kotylēdn a plant (prob. navelwort), lit., a cuplike hollow, deriv. of kotýlē cup


cot⋅y⋅le⋅don⋅al, cot⋅y⋅le⋅don⋅ar⋅y [kot-l-eed-n-er-ee] , cot⋅y⋅le⋅don⋅ous, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To cotyledon
cot·y·le·don   (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.


[Latin cotylēdōn, navelwort, from Greek kotulēdōn, from kotulē, hollow object.]
cot'y·le'don·ar'y (-ēd'n-ěr'ē), cot'y·le'don·al (-ēd'n-əl), cot'y·le'do·nous (-ēd'n-əs) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: cot·y·le·don
Pronunciation: "kät-&l-'Ed-&n
Function: noun
1 : a lobule of amammalian placenta
2 : the first leaf or one of the first pair or whorl of leaves developed by the embryo of a seed plant or of some lower plants (as ferns) —cot·y·le·don·ary /-'Ed-&n-"er-E/ adjective
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

cotyledon cot·y·le·don (kŏt'l-ēd'n)
n.

  1. One of the lobules constituting the uterine side of the placenta, consisting mainly of a rounded mass of villi.

  2. A leaf of the embryo of a seed plant, which, upon germination either remains in the seed or emerges, enlarges, and becomes green; a seed leaf.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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