cotyledon - Definitions from Dictionary.com

8 results for: cotyledon

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

cot·y·le·don

Audio Help [kot-l-eed-n] Pronunciation Key

–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 kotylédn a plant (prob. navelwort), lit., a cuplike hollow, deriv. of kotýlé cup

]

—Related forms

cot·y·le·don·al, cot·y·le·don·ar·y

Audio Help [kot-l-eed-n-er-ee] Pronunciation Key, cot·y·le·don·ous, adjective

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
cotyledon

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American Heritage Dictionary - Cite This Source - Share This

cot·y·le·don Audio Help (kŏt'l-ēd'n) Pronunciation Key
n.

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.
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.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

WordNet - Cite This Source - Share This

cotyledon
noun
embryonic leaf in seed-bearing plants

The American Heritage Science Dictionary - Cite This Source - Share This

cotyledon Audio Help (kŏt'l-ēd'n) Pronunciation Key
A leaf of the embryo of a seed-bearing plant. Most cotyledons emerge, enlarge, and become green after the seed has germinated. Cotyledons either store food for the growing embryo (as in monocotyledons) or absorb food that has been stored in the endosperm (as in other angiosperms) for eventual distribution to the growing parts of the embryo. Also called seed leaf. See more at eudicotyledon , monocotyledon.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

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

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

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
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

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Cotyledon

A*cot`y*le"don\ (#; 277), n. [Gr. 'a priv. + ? anything cup-shaped. See Cotyledon.] (Bot.) A plant which has no cotyledons, as the dodder and all flowerless plants.

On-line Medical Dictionary - Cite This Source - Share This

cotyledon

cotyledon: in CancerWEB's On-line Medical Dictionary

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