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Definition of thorn
- a source of discomfort, annoyance, or difficulty; an irritation or an obstacle:the issue has become a thorn in renewing the peace talksSee also a thorn in someone's side below.
- 3an Old English and Icelandic runic letter, Þ or þ, representing the dental fricatives /T͟H/ and /TH/. In English it was eventually superseded by the digraph th. Compare with eth.[so named from the word of which it was the first letter]
Old English, of Germanic origin; related to Dutch doorn and German Dorn