root-hair

root hair

noun
an elongated tubular extension of an epidermal cell of a root, serving to absorb water and minerals from the soil.

Origin:
1855–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
root hair
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
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
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