Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “root”


noun [C] (PLANT PART)   /rut, rʊt/ biology
the part of a plant which grows down into the earth The root of a hair, tooth, or nail is the part of it that is inside the body.
(Definition of root noun (PLANT PART) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of root

Browse related topics

You are looking at an entry to do with Parts of plants, but you might be interested in these topics from the Plant anatomy topic area:

Definitions of “root” in other dictionaries

Word of the Day


a person or group who receives money, advantages, etc. as a result of something else

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