Definition of thorn noun from the Oxford Advanced Learner's Dictionary

     

    thorn

     noun
    noun
    BrE BrE//θɔːn//
     
    ; NAmE NAmE//θɔːrn//
     
    Phonetics
     
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  1. 1 a small sharp pointed part on the stem of some plants, such as roses
  2. 2a tree or bush that has thorns see also blackthorn, hawthorn
  3. 3 (phonetics) the letter that was used in Old English and Icelandic to represent the sounds /θ/ and /ð/ and later written as th See related entries: Phonetics
  4. Word Origin Old English, of Germanic origin; related to Dutch doorn and German Dorn.Idioms
    a thorn in somebody’s flesh/side
     
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    a person or thing that repeatedly annoys somebody or stops them from doing something
See the Oxford Advanced American Dictionary entry: thorn