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rhizome

[rahy-zohm]
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noun Botany.
  1. a rootlike subterranean stem, commonly horizontal in position, that usually produces roots below and sends up shoots progressively from the upper surface.

Origin of rhizome

1835–45; < New Latin rhizoma < Greek rhízōma root, stem, noun of result from rhizoûn to fix firmly, take root, derivative of rhíza root1
Related formsrhi·zom·a·tous [rahy-zom-uh-tuh s, -zoh-muh-] /raɪˈzɒm ə təs, -ˈzoʊ mə-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for rhizome

rhizome

noun
  1. a thick horizontal underground stem of plants such as the mint and iris whose buds develop new roots and shootsAlso called: rootstock, rootstalk
Derived Formsrhizomatous (raɪˈzɒmətəs, -ˈzəʊ-), adjective

Word Origin

C19: from New Latin rhizoma, from Greek, from rhiza a root
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

Word Origin and History for rhizome

n.

1832, from Modern Latin rhizoma, from Greek rhizoma "mass of tree roots," from rhizoun "cause to strike root, root into the ground, plant," from rhiza "root," probably from PIE *wrad- "branch, root" (cf. Latin radix "root," Old Norse rot "root," Old English wyrt "plant, herb;" see radish).

Online Etymology Dictionary, © 2010 Douglas Harper

rhizome in Science

rhizome

[rīzōm′]
  1. A plant stem that grows horizontally under or along the ground and often sends out roots and shoots. New plants develop from the shoots. Ginger, iris, and violets have rhizomes. Also called rootstock Compare bulb corm runner tuber.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.