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Meaning of “root” - Learner’s Dictionary

root

noun [C]     /ruːt/
PLANT
B2 the part of a plant that grows under the ground and gets water and food from the soilParts of plants
HAIR/TOOTH
the part of a hair or tooth that is under the skinHairThe teethDentistryProblems with bones, joints and teeth
the root of sth
the cause of something, usually something bad: the root of all evil →  See also grass roots Origins and sources
(Definition of root from the Cambridge Learner’s Dictionary © Cambridge University Press)
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