Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “root”


noun [C]     /ruːt/
PLANT B2 the part of a plant that grows under the ground and gets water and food from the soil Parts of plants
HAIR/TOOTH the part of a hair or tooth that is under the skin HairThe 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 rootsOrigins and sources
(Definition of root noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “root” in other dictionaries

Word of the Day


relating to behaviour between people that is pleasant and friendly, often despite a difficult situation

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More