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English definition of “root”

root

noun [C] uk   /ruːt/ us  

root noun [C] (PLANT PART)

B2 the part of a plant that grows down into the earth to get water and food and holds the plant firm in the groundParts of plants

root noun [C] (CAUSE/ORIGIN)

C1 the cause or origin of something bad: We must get to the root of (= discover the cause of) this problem. What is/lies at the root of the problem is their lack of interest. The high crime rate has its roots in unemployment and poverty. So what's the root cause of his anxiety?Origins and sources roots B2 [plural] origins: The city of Tours can trace its roots back to Roman times.
See also
Origins and sources

root noun [C] (OF TOOTH/HAIR/NAIL)

the part of a hair, tooth, or nail that is under the skinHairThe skin, hair and bone of non-human animals

root noun [C] (OF WORD)

specialized language 76tyyyyyyyyyyyThe root of a word is its most basic form, to which other parts, such as affixes, can be added: The root of the word 'sitting' is 'sit'.Morphology and parts of words

root noun [C] (IN MATHEMATICS)

specialized mathematics a solution of some equations (= mathematical statements)Calculations and calculatingAddition, subtraction, multiplication and division specialized A root of a particular number is another number that, when multiplied by itself one or more times, reaches that number: The square root of 64 is 8, and the cube root of 64 is 4.Terms for numbers

root

verb uk   /ruːt/ us  

root verb (LOOK)

[I usually + adv/prep] to look for something by turning things over: She rooted through/among the papers on her desk. The pigs rooted for acorns in the forest.Searching

root verb (PLANT)

[I] to grow roots: The trees failed to root and so died.Flowers - general wordsFlowers and flowering plants
(Definition of root from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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