[ep-i-kot-l, ep-i-kot-l]
noun Botany.
(in the embryo of a plant) that part of the stem above the cotyledons.

1875–80; epi- + Greek kotýlē cup

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World English Dictionary
epicotyl (ˌɛpɪˈkɒtɪl)
the part of an embryo plant stem above the cotyledons but beneath the terminal bud
[C19: from epi- + Greek kotulē; see cotyledon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
epicotyl   (ěp'ĭ-kŏt'l)  Pronunciation Key 
The stem of a seedling or embryo located between the cotyledons and the first true leaves.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
After emerging from the ground, the simultaneous growth of the initial leaf and its epicotyl is observed.
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