thorn
noun /θɔːn/
/θɔːrn/
Idioms 
enlarge imagea small sharp, pointed part on the stem of some plants, such as rosesTopics Plants and treesc2
enlarge image- a tree or bush that has thorns see also blackthorn, hawthorn
- the letter that was used in Old English and Icelandic to represent the sounds /θ/ and /ð/ and later written as thTopics Languagec2
Word OriginOld English, of Germanic origin; related to Dutch doorn and German Dorn.
Idioms
a thorn in somebody’s flesh/side
- a person or thing that repeatedly annoys somebody or stops them from doing something