noun Botany.
the primary or rudimentary leaf of the embryo of seed plants.
Anatomy. any of several lobules of the placenta.

1535–45; < Latin: navelwort < Greek kotylēdṓn a plant (probably navelwort), literally, a cuplike hollow, derivative of kotýlē cup

cotyledonal, cotyledonary [kot-l-eed-n-er-ee] , cotyledonous, adjective
noncotyledonal, adjective
noncotyledonary, adjective
noncotyledonous, adjective
pseudocotyledonal, adjective
pseudocotyledonary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cotyledonary
World English Dictionary
cotyledon (ˌkɒtɪˈliːdən)
1.  a simple embryonic leaf in seed-bearing plants, which, in some species, forms the first green leaf after germination
2.  a tuft of villi on the mammalian placenta
[C16: from Latin: a plant, navelwort, from Greek kotulēdōn, from kotulē cup, hollow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

from 1540s, in various sense, from L. cotyledon "pennywort, navelwort," from Gk. kotyledon "cup-shaped cavity," from kotyle "hollow thing, small vessel," also the name of a small liquid measure. Botanical sense is 1776, from Linnaeus (1751).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

cotyledon cot·y·le·don (kŏt'l-ēd'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.
Cite This Source
American Heritage
Science Dictionary
cotyledon  [%PREMIUM_LINK%]     (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. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature