[ hahy-puh-kot-l ]
/ ˌhaɪ pəˈkɒt l /

noun Botany.

the part of a plant embryo directly below the cotyledons, forming a connection with the radicle.

Origin of hypocotyl

First recorded in 1875–80; hypo- + cotyl(edon)

Related forms

hy·po·cot·y·lous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hypocotyl

British Dictionary definitions for hypocotyl


/ (ˌhaɪpəˈkɒtɪl) /


the part of an embryo plant between the cotyledons and the radicle

Derived Forms

hypocotylous, adjective

Word Origin for hypocotyl

C19: from hypo- + cotyl (edon)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for hypocotyl


[ hīpə-kŏt′l ]

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.
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