Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “root”

root

noun  /rut, rʊt/ us  

root noun (PLANT PART)

[C] biology the part of a plant which grows down into the earth [C] biology The root of a hair, tooth, or nail is the part of it that is inside the body.

root noun (ORIGIN)

[C] the origin or source of something: We must get to the root of this problem.

root noun (WORD)

[C] the basic form of a word, to which prefixes or endings can be added: The root of the word "sitting" is "sit."

root noun (number)

algebra a number that is the solution of an equation (= mathematical statement)
rooted
adjective [not gradable]  /ˈrut̬·əd, ˈrʊt̬-/ us  
deeply rooted loyalty

root

verb [I/T]  /rut, rʊt/ us  

root verb [I/T] (PLANT PART)

(of a plant) to develop roots and begin to grow
(Definition of root from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of root?
Browse related topics

You are looking at an entry to do with Complete and whole, but you might be interested in these topics from the Full and empty topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “root” in other dictionaries

Word of the Day

debut

the occasion when someone performs or presents something to the public for the first time

Word of the Day

Come on – you can do it! Phrasal verbs with ‘come’.

by Liz Walter​,
November 19, 2014
As part of an occasional series on the tricky subject of phrasal verbs, this blog looks at ones formed with the verb ‘come’. If you are reading this blog, I’m sure you already know come from, as it is one of the first things you learn in class: I come from Scotland/Spain.

Read More 

silver splicer noun

November 17, 2014
informal a person who marries in later life Newly retired and now newlywed – rise of the ‘silver splicers’ Reaching pension age becomes a trigger to tie the knot as baby-boomers begin to redefine retirement

Read More