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root hair

noun
1.
an elongated tubular extension of an epidermal cell of a root, serving to absorb water and minerals from the soil.
Origin of root hair
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for root hair
Historical Examples
  • These fingerlike processes are (unlike a root hair) made up of many cells.

    A Civic Biology George William Hunter
  • The interior of the root hair is more or less filled with a fluid called cell sap.

    A Civic Biology George William Hunter
  • The fluid in the root hair is denser than the soil water; hence the greater flow is toward the interior of the root hair.

    A Civic Biology George William Hunter
  • When placed in water, it gives a very accurate picture of the root hair at work.

    A Civic Biology George William Hunter
  • The cell sap, which partly fills the interior of the root hair, is a fluid of greater density than the water outside in the soil.

    A Civic Biology George William Hunter
  • Examined under the microscope, these particles of soil seem to be cemented to the sticky surface of the root hair.

    A Civic Biology George William Hunter
British Dictionary definitions for root hair

root hair

noun
1.
any of the hollow hairlike outgrowths of the outer cells of a root, just behind the tip, that absorb water and salts from the soil
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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root hair in Science
root hair  
A hairlike outgrowth of a plant root that absorbs water and minerals from the soil. Root hairs are tubular extensions of the epidermis that greatly increase the surface area of the root. They are constantly dying off and being replaced by new ones as the root grows and extends itself into the soil.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Difficulty index for root hair

Few English speakers likely know this word

Word Value for root

4
4
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