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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
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for root hairs

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 hairs 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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