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[kot-l-eed-n] /ˌkɒt lˈid n/
noun, Botany.
the primary or rudimentary leaf of the embryo of seed plants.
Anatomy. any of several lobules of the placenta.
Origin of cotyledon
1535-45; < Latin: navelwort < Greek kotylēdṓn a plant (probably navelwort), literally, a cuplike hollow, derivative of kotýlē cup
Related forms
cotyledonal, cotyledonary
[kot-l-eed-n-er-ee] /ˌkɒt lˈid nˌɛr i/ (Show IPA),
cotyledonous, adjective
noncotyledonal, adjective
noncotyledonary, adjective
noncotyledonous, adjective
pseudocotyledonal, adjective
pseudocotyledonary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for cotyledonary
Historical Examples
British Dictionary definitions for cotyledonary


a simple embryonic leaf in seed-bearing plants, which, in some species, forms the first green leaf after germination
a tuft of villi on the mammalian placenta
Derived Forms
cotyledonous, cotyledonoid, adjective
cotyledonal, adjective
cotyledonary, adjective
Word Origin
C16: from Latin: a plant, navelwort, from Greek kotulēdōn, from kotulē cup, hollow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for cotyledonary



from 1540s, in various sense, from Latin cotyledon "pennywort, navelwort," from Greek kotyledon "cup-shaped cavity," from kotyle "hollow thing, small vessel," also the name of a small liquid measure (nearly a half-pint); of uncertain origin. Botanical sense is 1776, from Linnaeus (1751).

Online Etymology Dictionary, © 2010 Douglas Harper
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cotyledonary in Medicine

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.
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cotyledonary in Science
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.
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