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root ball
root beer
root canal
root cap
root cellar
root climber
root crop
root directory
root hair
root knot
root mean square
root nodule
root out
root pressure
root rot
root system
root up
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root hair

root hair (plural root hairs)


noun 
Definition:
 
outgrowth of root resembling hair: a fine growth from the outer cells of a plant root that resembles a hair and absorbs nutrients. Root hairs are elongated epidermal cells that increase the surface area of roots to improve absorption of water and minerals.

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