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mycorrhiza

or my·co·rhi·za

[mahy-kuh-rahy-zuh]
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noun, plural my·cor·rhi·zae [mahy-kuh-rahy-zee] /ˌmaɪ kəˈraɪ zi/, my·cor·rhi·zas. Plant Pathology.
  1. a symbiotic association of the mycelium of a fungus, especially a basidiomycete, with the roots of certain plants, in which the hyphae form a closely woven mass around the rootlets or penetrate the cells of the root.

Origin of mycorrhiza

First recorded in 1890–95; myco- + -rrhiza
Also called fungus root.
Related formsmy·cor·rhi·zal, my·co·rhi·zal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for mycorrhiza

mycorrhiza

mycorhiza

noun plural -zae (-ziː) or -zas
  1. an association of a fungus and a plant in which the fungus lives within or on the outside of the plant's roots forming a symbiotic or parasitic relationshipSee ectotrophic mycorrhiza, endotrophic mycorrhiza
Derived Formsmycorrhizal or mycorhizal, adjective

Word Origin

C19: from myco- + Greek rhiza 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

mycorrhiza in Science

mycorrhiza

[mī′kə-rīzə]
  1. The symbiotic association of the mycelium of a fungus with the roots of plants. The majority of vascular plants have mycorrhizae. The fungus assists in the absorption of minerals and water from the soil and defends the roots from other fungi and nematodes, while the plant provides carbohydrates to the fungus. There are two kinds of mycorrhizae: endomycorrhizae, in which the fungal hyphae enter the cells of the root cortex, and ectomycorrhizae, in which they surround the cells.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.