hypocotylous

hypocotyl

[hahy-puh-kot-l]
noun Botany.
the part of a plant embryo directly below the cotyledons, forming a connection with the radicle.

Origin:
1875–80; hypo- + cotyl(edon)

hypocotylous, adjective
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Collins
World English Dictionary
hypocotyl (ˌhaɪpəˈkɒtɪl)
 
n
the part of an embryo plant between the cotyledons and the radicle
 
[C19: from hypo- + cotyl(edon)]
 
hypo'cotylous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hypocotyl   (hī'pə-kŏt'l)  Pronunciation Key 
The part of a plant embryo or seedling that lies between the radicle and the cotyledons. Upon germination, the hypocotyl pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem. Most seed-bearing plants have hypocotyls, but the grasses have different, specialized structures.
The American Heritage® Science Dictionary
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