root hair


Definition of root hair

: a filamentous extension of an epidermal cell near the tip of a rootlet that functions in absorption of water and minerals — see seedling illustration

Examples of root hair in a Sentence

Recent Examples on the Web Once the tree roots reach the edge, the leading root hairs grow through but then are pinched by the fabric. Adrian Higgins, idahostatesman, 20 Dec. 2017 When your plant is transplanted, it can be stressed if there is damage to root hairs, as this will impede water absorption until the plant can replace them. Rita Perwich,, 5 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'root hair.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of root hair

1841, in the meaning defined above

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Time Traveler for root hair

Time Traveler

The first known use of root hair was in 1841

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Dictionary Entries Near root hair

root graft

root hair


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Cite this Entry

“Root hair.” Dictionary, Merriam-Webster, Accessed 2 Jul. 2022.

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