coleorhiza

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co·le·o·rhi·za

 (kō′lē-ə-rī′zə, kŏl′ē-)
n. pl. co·le·o·rhi·zae (-zē)
A protective sheath enclosing the embryonic root of grasses.

[New Latin : Greek koleon, sheath; see kel- in Indo-European roots + Greek rhiza, root; see wrād- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

coleorhiza

(ˌkɒlɪəˈraɪzə) or

coleorrhiza

n, pl -zae (-ziː)
(Botany) a protective sheath around the radicle in grasses
[C19: from New Latin, from Greek koleon sheath + rhiza root]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

co•le•o•rhi•za

(ˌkoʊ li əˈraɪ zə, ˌkɒl i-)

n., pl. -zae (-zē).
the sheath that encloses the primary root in embryonic grasses.
[1865–70; < New Latin < Greek koleó(n) sheath, scabbard + rhíza root1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.