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coleorhiza

[ koh-lee-uh-rahy-zuh, kol-ee- ]

noun

, Botany.
, plural co·le·o·rhi·zae [koh-lee-, uh, -, rahy, -zee, kol-ee-].
  1. the sheath that envelops the radicle in certain plants and that is penetrated by the root in germination.


coleorhiza

/ ˌkɒlɪəˈraɪzə /

noun

  1. a protective sheath around the radicle in grasses
“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


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Word History and Origins

Origin of coleorhiza1

1865–70; < New Latin < Greek koleó ( n ) sheath, scabbard + rhíza root 1
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Word History and Origins

Origin of coleorhiza1

C19: from New Latin, from Greek koleon sheath + rhiza root
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Example Sentences

Germination.—In germination the coleorhiza lengthens, ruptures the pericarp, and fixes the grain to the ground by developing numerous hairs.

Coleorhiza, kol-ē-ō-rī′za, n. the root-sheath in endogens.

The sheath which envelopes the radicle is called coleorhiza and that of the plumule, pileole or germ-sheath.

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