名词
1. (某些植物、树木上的)刺,棘刺
Thorns are the sharp points on some plants and trees, for example on a rose bush.
2. 荆棘;带刺的树;带刺小灌木
A thorn or a thorn bush or a thorn tree is a bush or tree which has a lot of thorns on it.
3. 肉中刺;长期困扰的问题
If you describe someone or something as a thorn in your side or a thorn in your flesh, you mean that they are a continuous problem to you or annoy you.