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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
root vegetable
rootage
rooted
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root nodule
root nod·ule (plural root nod·ules)


noun 
Definition:
 
swelling on root: a swelling on the roots of leguminous plants such as alfalfa, soybeans, and peas, caused by symbiotic bacteria that can fix nitrogen in the soil
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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